I was ordering some piezo supplies last night, and threw a set of Planet Waves Auto-trim tuners on the order, just because I love them. The tuners on this guitar aren't bad really, I just think the PW's are better, and the auto-trim schtick is pretty fun. And they look pretty awesome.
I've got them on two other guitars already. I've got some Sperzels on another guitar, and they probably function about as well as the PW's, but for whatever reason I like the PW's more.
Planet Waves : Auto-Trim Tuning Machines 3 + 3
I like the PW's; though I don't think the posts need to be as tall as they are, since multiple windings aren't necessary. they're really solidly built, but at the expense of weighing more.
I emailed daddario/PW a while back about releasing a bass version and they pretty much confirmed that would never happen.
have you noticed a weight difference between the PW's and sperzels, leon?