Roger.
I have layed with this product, glue down and nailed / screwed / secret nailed.
All have their good and bad.
Elastilon is good where you cant do the other methods, want a quicker easier result (and it is easy) or cant wait for dpm's to dry or the glue smell will bother. Much thinner than a ply line and nail job.
There is however a limit to width of board, cant remember how wide but worth checking.
I have to say that if you stamp on it (concrete floor) it sounds and moves no different to a glued down.
You will still have to try to get a mm perfect level sub floor, but it is pretty good.
Go on give it a go, I know you're tring to convince yourself to...
Mark