How much have you used? Ever a complaint? Ever been suspect of failure upon a return visit? What wont you use it on? I'm looking at an opportunity to get quite a bit of referrals on new installs from some flooring retailers in town as the one and only "sealer lady" is about to retire... She gave us a bid on doing our home and it was reasonable but not if I had to hand apply a product to each and every grout line. I'd like to stick to my slop and mop technique for 12 x 12 and smaller installs. Granite and other dense stones would get a Stone Pro product. Other than a failure with one of Cobb's other sealing products, I've yet to see UltraSeal not perform, how about you?