I have a Felt, but mine is the F series not the ZW series. I love my Felt, but everyone is a bit different in what they need and what feels right for them. I tried the Dolce (and from what I could tell the Ruby and Dolce have the same geometry) and felt cramped on it, where as soon as I got on the Felt it just felt right. I didn't get to try the Ameria since they didn't have one in my size.