First of all, the self-locking catches at front and rear are VERY good indeed - extremely well engineered positive and firm. No problems at all with them - I'd be surprised if any other folder matches them for practicality or durability. And because of their adjustability, they don't really wear in - once set up right, they seem to keep on doing what they are supposed to do in exactly the same way. The front catch has had a couple of big bashes when the bike has been dropped accidentally, and has survived without any ill effects (bar a little scratching to the black paint) - its a very solid bit of metal

Front wheel catch has not been problematic. It has worn in slightly, which I think has made it a bit easier when folding. The only issue here is the plastic nut on the QR skewer, which does sometimes need a bit of adjusting to ensure the QR isn't getting too loose or tight. The safety clip on the front wheel is very good indeed - a couple of times over the last year in a haze of absentmindedness I've forgotten to clamp the QR on the front wheel, and only found out when I've got home (thanks to the safety, without incident).

I've not had probs with the handlebars - at first I found them a bit creaky and flexible, but then I got my allen key out and adjusted the snap/clip - each one is micro adjustable through a pair of small threaded screws. Once it was perfectly set up, I had no problems at all - rock solid (having said that I may also have become accustomed to them a bit over time - I guess its hard to say). My friend with the Birdy liked the Mezzo in part because of the way the front feels - he found the balance of the Birdy meant that he tended to sit back a bit; he prefered the Mezzo because he likes to work hard on the handlebars. The picture at http://www.mezzobikes.com/wp-mezzo/?p=5 is 95% PR puff, but i guess it shows that the bars can't be THAT flexible...

The only negative on the bike that I have found are the tyres, which are cheap chinese low-mid-pressure jobs and worth replacing. And maybe the decision by ATB not to build the rear wheel around a Capreo hub is a bit daft, as limits your highest gear to the 11t on the 11-26 SRAM cassette it comes with. Low gearing is fine, but it might have been nice to have the option of the Capreo 9-26. If you spend your life at the top of your gearing then might prove a bit frustrating. But i've found that in London traffic its not an issue.