Just by way of an update to this (in case someone comes across this thread, pondering the same questions in the future), still fairly happy with the Dunlopillo Ecstasy mattress we bought aside from one thing. It is fairly significant problem though. It weighs a ton! Or to be precise 200Kg!
I knew latex mattresses are heavy but I didn't realise exactly HOW heavy and it's something I forget to physically check in the store. I wrongly assumed it would be about the same as the Omazz Falcohn we had, also latex, and could thus be flipped easily. No way can the Ecstasy be flipped unless you have 3 other guys to help you do it. 2, maybe if they are strong burly guys.
The Falcohn here was around THB 80,000 when we were looking, the Ecstasy we got for 40K approx. Were I shopping again, I'd go for the Falcohn for sure, so much so that we are thinking of getting rid of the Ecstasy, selling it second hand while it is still in excellent condition. The weight is THAT much of a PITA.