Has anyone used this? I want the locking studs, but I think the Tonepros are outrageously priced since it's an $80 difference between them and a regular gotoh setup and it's basically just an extra nut on the studs (at least, that's what it looks like to me judging from the pictures. I haven't seen it is person.) I found this Wilkinson one, and it seems like it is claiming to be a cheap version of the Tonepros idea:
http://yhst-50206111187217.stores.yahoo.net/wibrrobrlost.html
http://yhst-50206111187217.stores.yahoo.net/wibrrobrlost.html