I like my Fein Tool, I've been using them for about 10 years, I finally bought my own 4 or 5 years ago. I've been seeing the infomercials on the tube lately and I must admit that I got a few new ideas on ways to use it.
I first used one when I had to put a hole in the back of a kitchen cabinet to hook the outlet up which was there for the purpose. The back was 1/4 inch hardwood ply and it was a deep cabinet, it was hard to get back in there with any muscle. The foreman loaned me his Fein Tool and it made short work of it.
For those uninitiated, it's like the saws that take a cast of your body - the blade vibrates rapidly, won't cut skin but will go through hard surfaces.
However, the blades are spendy $50 on average. I found this site which gives a review of an aftermarket brand, Yaeger:
http://www.toolsnob.com/archives/2009/02/yaeger_after_market_blades_for.php
They say go to:
http://www.yaegerblades.com/
I tried but they won't let me in w/o an account nor give me the means to get an account.
Anybody use any aftermarket blades for the Fein?