Looking at the above, and wondering if people have an opinion on either.
I am 5'11", 31" inside leg, and thinking a 58 in the Cube as Cube sizes seem small.
Also looking at Cannondale quicks and Specialized Sirrus.
Opinions please?

Anyone have a Hyde? Or Felt?

I have a Cube Editor which is a higher class of Hyde (Editor > Hyde Race > Hyde Pro > Hyde). It's pretty much the same as Hyde except it has better components but you can achieve same result by buying Hyde and upgrading it later (I guess there are a few features that you won't be able to upgrade but they're not that important).

About the bike itself, I couldn't be happier about it. The bike is perfect for commuting and city biking in general. It has a rather rigid frame and fork, thus is not very suitable for any off-road biking but on a flat road it goes like crazy! Extremely fast and light. Also, good for any busy-street biking where you have to manoeuvre between people/cars/other obstacles in a road. Definitely a recommendation from me if that's what you're looking for in a bike.