I looked at the Sperzel locking tuners, but these were $40 less expensive.
Price: $50.00 (new)
Where Obtained: Guitar Center
This locking tuner has an automatic string cutter. I replaced my Grover 18:1 tuners with these. I did not have to drill any holes for the install. The instalation was simple.
Put the string in, tighten, tune, excess string falls off!
I am not sure if these are reliable for live playing. The first time I tried to use this, the B string broke and slipped out of the tuner.
3 B strings and 1 E string later... I realized a couple things that I hope I can do in the future that won't cause me to have to canabalize string sets.