That's nice. However, it is just your personal opinion.I don't believe in cement board. I think it's garbage.......
.....I always shake my head when I see people insist on Concrete board. Concrete board is a joke. The stuff is a pain to cut, a pain to screw and you end up with MORE joints (more places to leak) because the sheets are smaller.... and the sheets are smaller because the junk weighs so much. It's old technology... forget it... it's time has passed!
My Tile Supplier (2nd generation tile guy that sells to the trades & public - and also installs) uses nothing but CBU for the substrates.
We will also stick to CBU for substrates. Easy to cut & quick to install when you know what you are doing. Much more stable substrate - over other products. Nothing wrong with adding other membranes and membrane systems over it.
We did 3 master custom-bathroom tile showers last month. Got another 1 coming up in 1 week, and many more scheduled for 2011, including a steam shower unit in an owner's spa suite. = CBU for all of them!