Product works great. I’ve had two Chapins and they are pretty uncomfortable. The Field King is very comfortable on my back and the handle pump is smooth. Please be aware that this manufacturer tests every product that comes off the line by putting water in the tank. Not all the water dries before packaging and shipping. I called them after I returned the first one after getting what I thought was unknown chemicals on my floor and hands and the replacement showed up with the same mystery liquid. If you don’t trust me their number is on the manual and the wait time for customer service to pick up was very quick.We have many trees that need sprayed for insects and this sprayer is SO EASY to use. We had been using all other types of sprayers: handheld little ones, pump sprayers and one on wheels. This is a backpack type that is heavy when filled (naturally). Pumping this requires using the side handle and it needs just a few pumps to get pressure.This has saved us TONS of time and is very easy to use. If you have a bit to spray, you will love this. So worth the money.This is a very easy to use sprayer. It comes with 5 different nozzles for a wide variety of uses. A bit heavy to put on by yourself with the capacity four gallons of liquid. I highly recommend this item. I am using it to apply sealer to our paver patio and it made to job a snap versus using a hand held 2 gallon sprayer.I've been using this sprayer weekly for a few months now for weeds and it is working great so far. It's kind of a generic type sprayer that seems to be sold by several distributors under different names. I replaced an older version of this exact same sprayer under a different name that was failing... broken strap connectors, pump handle coming off, fluid leaking all over my back (not good), etc. I do not know how old or how well taken care of the replaced one is as it was inherited. I hope this new sprayer does not have the same issues. The sprayer nozzle puts out a nice pattern but uses a lot of product, even with the smallest orifice installed (reason for the 4 instead of 5 stars). I also use a Round-up brand sprayer that has a much nicer atomizer type nozzle and uses much less product. I doesn't have the spray distance however. Over all I'm happy with this sprayer and would recommend.It's a little more $ than the smaller hand held ones but worth it. I just moved to a place with a long gravel driveway and was getting tired of filling up the smaller one, not to mention having to set it down everytime to pump. This larger one is easy to put together and easy to use. Im so glad I made the investment.Trivial to assemble. Easy to use. I just bought and used to sprayed 2400 sq ft and the device did its job perfectly. Spray was even. Pumping was easier than I expected. With spray-lock on I could just gently pump every few seconds and keep the spray going. I was skeptical due to low price, but was impressed. Comes with multiple nozzles for different jobs (spot, area). Has gallon marks on the sides to make mixing easier. I definitely recommend for home owners.Very comfortable backpack sprayer. Got it to spray roundup on the poison ivy in my yard. Had two gallons up there and wore it for about an hour. Easy. I do wish it had a retractable pump handle but I’ll live.Works fine but not comfortable and awkward to get on when full.