NoMorePly does make the floor more rigid – sticking Nomoreply using Mega glue is like when you laminate a surface you make it more rigid (exactly why plywood is as strong as it is). But also with the glue being as flexible (and as strong) as it is, it effectively decouples the floor.
With Nomoreply being made from cement fibre composition it is dimensionally very stable (unlike plywood). As distributor we have sold thousands of sheets, I have not had a single problem with it. As with all products /systems it is important manufacturers guidelines are followed, and common sense is used, the floor should be in good order, and any loose boards made good, if the floor is springing other remedial work may be necessary prior to the laying of the NoMorePly.
BBA (British Board of Agreement) certification is a few weeks away, this is a lengthy process, but I feel an important one - the product has been fully tested and evaluated, and I know some senior TTA members have been involved and produced reports on this system.
As you say at the end of every post "Opinions are given in good faith but manufacturers have the last word, their guidelines must be followed"
I have always followed the Manufacturers Guidlines - all my customers who include Councils, hospitals, developers, Tilers who have tried the product keep coming back.
I am currently evaluating Aquamix with a view to distributing it, Ian Taylor kindly came to see me, sampled me up and we are now trying the product. Its difficult for me as I am a dyed in the wool Lithofin User/Stockist - my gut instinct is that water based sealants don't work - but they clearly work well, so I have to be open minded and adjust my mindset