Just wanted to throw my two cents in.

My Pro Tour came with internal wiring for this type of generator (very similar to the Velo Sport above) and I like unique, outdated tech (be honest, who here doesn't feel the same way about certain things, if not dynamos?) so i thought I'd give the BB generator a try. Posted in the Looking For thread and Iowegian was there to supply me with the goods (Union BB dynamo... not sure of age, but before Germany's reunification).

I love it. I'm sure that a hub dynamo is probably better, but I saved at least $80-100 doing it this way; not too shabby. So far it works when I need it to. Once or twice a major bump has knocked it out of alignment and I get the flickery light that others of talked about, but that's still better than running out of batteries on the road. If it breaks, I had planned on getting a hub dynamo to replace it, but with the $45 replacements from Peter White now.... It's a more complicated decision (thankfully not one I have to make just yet).

My only complaint is that the headlamp isn't as bright as I want it to be sometimes, but besides being a minor complaint (it's always bright enough, sometimes I just want brighter), I also feel this has to do more with using 30 year old lamp technology than 30 year old dynamo technology.