I have an old union bottom bracket-style generator and have no complaints about how it works. The front light isn't quite as bright as I'd prefer—which I chalk up to being 30 year-old halogen technology rather than any problem with the generator (and the lens does cast a great pattern)—and occasionally it'll kick itself out of alignment after going over a big curb—which I imagine isn't so much a problem with bottle-styles—but otherwise it does its job and does it well. I imagine the old Union bottle generators are of similar quality.

Check yellowjersey.
Peter White also has some really nice bottle style generators—nice as in they cost quite a bit more than a basic dynohub—so I can only assume that there are decent new generators out there.