Top positive review
Careful on large areas and using the Ditra Kerdi strip for water tight installations.
Reviewed in the United States on November 20, 2015
This has some minor flaws and takes some practice getting used to.
The membrane is much thicker than Ditra's 1/8 membrane for non-heated areas. Thus, the concept of mixing this with there other product should be nixed in your thinking. For a large area, say a kitchen/open space, where you don't need heat for some of the floor (say where counters go, or where you know furniture will be semi-permanently) you should still use this more expensive membrane and not mix with the "standard" 1/8.
because it is thicker, it wants to pop off the floor as it retains its roll. You need to weigh down the ends to make it stick.
If your mortar underneath is uneven, it is very hard to smooth this out on a large floor. You really do want a way to squeeze this out.
The seams combined with the kerdi strip will be significantly thicker. This is a bit of a pain if you are using thin set mortar that is "loose" as it is hard to keep the tiles even across the strip.
The membrane, in my experience, seems to accentuate any floor uneveness, not smooth it out as you would expect. If I had it to do over again, I would have put a 1/4" hardboard on top of the subfloor.
It works well with NuHeat cabling, which I think is superior to the Ditra heat cabling. Note that the NuHeat cabling calls for a 3" and 2" staggered or all 3" staggered layout of the cables. The Ditra membrane has spacing that is a bit different than that, so you want to use the 3 and 2 staggered just to get to the same 3 inch all layout that is recommended. This is not a criticism of the product, just an installation note if you use NuHeat.
The installation instructions are "OK" but not great. They seem to combine the instructions between their standard product and the Heat product.
Overall, this is a good product, but it was not the no brainer I wanted it to be <grin>. Be careful on large areas and remodel floors versus new floors.