Any thoughts out there on comparison with this and freakey? Any other key-based effects out there worth noting?
Keymaster is a multi-phase routine using 3 keys (2 gimmicked). You're switching them out via standard coin moves, and it even contains a vanishing keyhole. All the keys can be examined at the end, and the routine is solid. They are made of very high quality brass, and will last a lifetime. For $30 it's a must have.
The other two I'd recommend are:
Flexion by Jon Allen - only $37 but does require buying keys to perform with. They cost about 19 cents each. Buy BRASS ONLY, many of the steel will snap like a twig and/or are hard to bend.
Lockpicks.com has these, which are AWESOME (I bought a thousand):
100 Ilco (IN3) (BRASS) $19.00
100 YALE (Y2) (6-Pin) (BRASS) $19.00
Killer Key by Sankey - very short opener type routine, cute principle. I'd only purchase this one after the other two listed above.