I recently installed Kelly Take-Offs with 7-speed indexing downtube shifters on my rain/beater bike to replace the former 7-speed indexing barcons. I wanted to be able to shift while standing and I could never do that with the barcons and the bike certainly didn't warrent the cost of STI/Ergo's.
Anyway, I'm happy with the change. The Take-Offs aren't as convenient as STI's but they are plenty close enough.