I went to HEL and back which helps. On a serious note the type of mattress that made it so good (closed cell foam) is very common in Finland and fairly common in the rest of scandinavia. Very comfortable (sufficiently so that I've switched to it at home, however availability in the US is poor compared to Finland and I couldn't get one quite as good, at any price; short of importing it myself).

Rather surprisingly none of the chains (including W and FS) have identical beds chain-wide. So you never know what you will get unless you have stayed there before. While I agree that in general W is better than the Westin bed, for example, there are exceptions to this (e.g. Westin Sydney has better beds than the W Sydney).