back in the '80s when we replaced the Huret Allvits on Schwinn Varsitys, the derailleur of choice was always a Shimano Eagle. The low-end Suntour was enough more that people didn't want to spend that much. But I would definitely take a Suntour GT over those things. The pivots on the Suntours did get sloppy after a while, but it didn't seem to affect shifting that much.