It seems better than the electric vest because it eliminates the need for a long sleeve sweater, etc. It's sure gets warm - in fact, I can't imagine a situation that would need the highest heating level. It has a high neck collar that I like.
The control switch is kind of bulky and awkward. It comes with an elastic band and you're supposed to strap it to your leg. I hooked it straight to the battery with the supplied harness.
Here's a link.
http://www.compacc.com/prod.cfm/cid/1001005/pid/18247