I've got the Zefal Gizmos on my commuter bike. They're OK. I wish they were a little more stable, and they stick out from the tube a little. Doesn't reallf affect anything, but looks a little funny. I like the looks of the Two Fish a lot better. If I had it to do over, I'd probably try that one.
You can drill & rivet bosses in. If you have triple butted or steel tubes this should work. Depending on the tube set. Find an experienced Ridley or Empella LBS (or the importer) as they do this all the time.
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