Backerboard Vs Membranes for floors

[Dan N.]

Just curious if anyone has used any of the membrane Products on the market as opposed to Backerboard or mud beds for tile floors. At a glance it looks like these products, such as Durock, would enable a much quicker installation and save a fair amount in labor costs. I also saw a brand with a peel and stick application that looks like it would be even faster. Thoughts?