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Well, Seven don’t do them AFAIK. In fact, not sure I’ve seen any titanium braze ons.
Outside of that, less adjustability. I may want to go for sub compact rings in the future and a braze on would limit derailleur choices/may prevent me from being able to use sub compact altogether.
They also look a bit dorky and can get damaged. There’s also no real advantage to it IMO - unless you find the clamp offensive - which I don’t.
Installed Chorus 12 yesterday. Went better than planned having never installed, worked on or used Campagnolo anything. Shifting was great in the stand so I was hoping it was on the road too. Fortunately, it was! Shifting is superb front and rear. Having four trim positions on a cassette as wide as 11-32 is really helpful. I was expecting it to be quite a noisy drive train - and it is - when you shift. It shifts with such a clunk that you know you have shifted. I like it. However when pedaling away, it's silent. One thing that is noticeable is it's simply not as easy to shift out of the saddle as Shimano, but that's okay.
Braking fantastic also and hoods incredibly comfortable - one of the main reasons I wanted to try Campagnolo in the first place.
Shout out to these Zonda's as well. They have gradually grown on me up until now where I can actually say I like them. The white background that product shots are taken on do these wheels no favours in the looks department. Ride wise, they are stiff under my current 90KGs of heft, have an almost silent freehub body which I wanted, hubs feel silky smooth, but most importantly and much to my surprise, they're really comfortable. The joint on the rim was almost invisible and the rim itself and it's braking surface are really well finished. For $350 I don't see what is not to like.