This is a movie that used to be on cable pay channels a lot in the late 1970s and early 80s. I thought it was terrible back then, but I bought the DVD anyway because it was cheap and Bo Svenson is a classic B-Movie hero.
Anyway, I watched it last night and it isn't very good, but it's definitely better than I remembered. There are a lot of plot holes, the stuntmen are very noticeable, and most of the characters (especially the cop played by Robert Culp) suffer from numerous brain farts, but at least it isn't boring.
Here it is in a nutshell:
http://www.youtube.com/watch?v=Ba1nvqsNCn0
Doesn't look bad ... I've always enjoyed cheesy 1970s action movies. May get it myself.