Along with the glue, this application is a bit tedious and messy, but compared to the hassle and dust backerboard, it's a true breeze. Installed in an 8'x8' bathroom (slab) in a couple hours after work, skimcoated the next evening, then started tiling the next. I have a hard time believing this is a substitute for mortar and backerboard on a wood subfloor application where flexing might be an issue, but supposedly this stuff does the trick. Definitely planning to use again!