i really like the sprayer. yes its a bit heavy when full at 4 gallons, but it is what it is. the backstrap is handy and fits well. the first sprayer i ordered didn't work. i called the toll free number, and got vm, but it was Labor day, so thats fine. next day, i had a text message to my number, from them, indicating they saw they missed a call and wanted to know if i needed help. how cool is that? i texted back and the response was immediate. within 10 minutes, they had already shipped another unit, it arrived the next day, and I was back in business. sometimes stuff goes wrong, sometimes things just don't work, for whatever reason. this company really seems to care about service, and it showed. they told me to keep the unit for extra parts, no questions asked. Jen was the person I dealt with, and our entire correspondence took place via text. I'm not afraid of the phone, but doing it via text was very convenient since i was at work. She was very helpful and I couldn't be more pleased with how the whole process played out. I would recommend this company and their products to anyone. thanks!!!!Unit arrived with broken orange cone nozzle. Contacted Jen in customer service through online chat and she sent replacement that I received in 2 days. Put on charger and noticed that orange and red lights on panel would blink off which seemed odd. The light on the charger was green so assumed battery was charged. The next morning the turned sprayer on and the orange light lite and there was a beeping sound. I checked the battery at it was at 7.2 volts. I called Nick in customer service and he said they would expedite ship a new battery and charger to me. I told him that i would try charging the battery with my charger which can charge at 2 Amps and he said to go ahead and try.I put battery on charger for about 30-40 minutes and got battery up to 10.2 volts before placing it back in the sprayer. I connected the charger to the sprayer and the first of the three green - battery status lights came on and the charger light turned red indicating that the battery was charging correctly. After the battery finished charging, charger light turns green and red caution light on sprayer turns red, it was at 12.2 volts. I checked again the next morning, to see if the battery was holding charge and it was still at 12.2 volts.I contacted Petratools customer service the next day to tell them about the problem being fixed. They told me to keep the battery and charger they had sent to me. They do plan to add additional information in the manual and on the website video.I have tried the sprayer twice now using the fan sprayer. The spray pattern is at least twice the width of my hand sprayer and it really sprayes a large volume. Not having to keep pumping the sprayer is a great plus. The straps are comfortable and once the pack is on your back you really don't notice the weight. Most sprayers come with one nozzle but to have 5 was a real plus.If you want a sprayer that can the work and is easy to use this is for you. Also the company is a great one that stands behind their product.The sprayer is great. I was hesistant to drop $200 on it, but it's well worth it. I was previously using a pump sprayer and the spray was less consistent, and I'd always feel like I was poisoning myself when unscrewing the top/releasing the pressure when I was done using it. This battery powered sprayer works more like a small pressure washer (doesn't build pressure inside the tank) and is super even/consistent. It's got a convenient drain plug, too.The only issue I had was that after the first use, the little filter inside was broken off and rattling around inside. I didn't check inside the tank closely before using it, so I don't know if it arrived broken, or if it somehow broke off while I was using it. Regardless, I contacted Petra Tools' customer service and Nina helped me out. She was super responsive, I sent her photos of the broken part, and she sent me out a replacement piece.The backpack unit I received did not work and was returned. While attempting to get the unit to work I put water in the unit and placed it on my back and with the unit half full it was extremely heavy and cumbersome. I ended up exchanging the unit for another unit designed to pull (with a price increase). The new unit “could” be an amazing product! The craftsmanship with the product is unparalleled, however just a few mods would take the product to the highest level. With the unit full of liquid I could not tighten the adjustable handle enough to prevent it from slipping and pulling apart. Also, the wheels do not elevate the unit high enough to roll above the grass. I ended up carrying the unit in one hand and spraying with the other since the adjustable handle and wheels are useless. I would also like to add the hose is extremely short and could use an additional 2-3 feet for more flexibility. Positive features include a fully adjustable pump and different spraying tips for every application you can dream up.This is the 3rd backpack battery-powered sprayer I have had, and is the best. Good Power.I like the drain valve at the bottom; however, it should have some sort of retainer to hold it on the sprayer. After cleaning it a few times, I forgot to put it back on the sprayer. (My fault, but a retainer or something fastening it to the sprayer would help).Favorite Thing- the pump is recessed, allowing for 99% of the product to be sprayed and not be left over when finished spraying.Least Favorite thing- I am forgetful and forget to put the cleaning valve on the bottom back on or misplace it while cleaning.Cool Feature- I do like the cleaning valve. It makes cleaning so much easier as I do not have to pick up the sprayer and dump it, just open the valve and rinse. This is a good feature that will probably catch on. They just need to put a retaining clip on the cap.Runs well after many hours of use with herbicide. The sprayer is slightly heavier than I would like having to work with it all day. However it is also sturdier than the lightest sprayers and will survive longer. Good set of nozzles, love that I can adjust pressure.Good product fast shipping!