First let say, this is one fantastic piece if machinery. Sprayed weed killer in my 1/2 acre backyard without any effort. The only reason I stopped is I ran out of chemicals. Their Customer Service is top notch. To me, there are a couple of drawbacks with this unit, but nothing that should stop you from buying. The first issue is the drain cap does not seal and still has a drip after tightening it as much as I can. The other draw back is the suction line. It appears there is a notch in the tank for the suction line but it does not stay, and leave about 1/2 to 1 gallon of chemical in the tank.