It's currently $49 on woot compared to $89 on amazon. I'll update this post in a week or so with a full review...
Edit - Fucking thing sucks. Wouldn't jump off a Focus with a weak battery. It was showing something like 11.5 volts at the battery, so it wasn't like ridiculously dead or anything. The battery pack's green light came on, but as far as I can tell it didn't do shit.
On the plus side, woot did refund my money. Anyone have any suggestions on one that actually works?