You know, not to put Sperzel down or anything, but honestly I had a set that came with a Carvin kit guitar I built, and I found them to be unstable with heavier strings, especially on my 56 gauge E string, I also noticed they developed loose spots where, once the string pulled out of tune, I wasn't able to just bring it up a touch, but had to detune then retune, and sometimes that didn't even work they would still slip, as far as being quick and easy, Yes, they were that and in alot of ways as far as string changes they were very quick, but If the darn things don't hold thier own and keep your strings in check, who cares?????? maybe I had a bad set??? but since I have been using Schaller, I have had no string slippage or tuning issues what so ever????? .........sorry, but after my experience, the little frills Sperzel offers with graduated post and changeable colored pegs, just don't mean jack too me. :dontknow: