Anyone know anything about the RoundUp brand backpack sprayer from Home Depot. They've got them onsale right now. Are these things pieces of junk. I've just got those little 3 gallon ones you tote around, but I've got to kill over 1000 sq ft of bermuda in my side yard so I can lay down st augustine next week. I don't know about dropping money on a Lesco one, how much are those anyways? Thanks.