For the price the winkl is a very good mattress (King size Winkl). Pros: great delivery service and trial period, good level of firmness and comfort. Cons: Bit of a struggle to unpack - definately need 2 people. It does heat up, however, we minimised this with a tencil/cotton mattress protector, it has a very slippery surface so a mattress protector will slip around and crease up a bit. We have stuck with it and I would recommend it as you have a trial period so if it doesn't suit you send it back. The Winkl is about 25cm deep and we have a high bed base so it is very high. If it was 20cm that would be better.