I've been watching this for a while now, and it's not a bad show. I didn't really care for the pranking on Overhaulin, and the builds took too long on American Hot Rod. I prefer the fact that they aren't building a car for a "mark", and that they're somewhat more down to earth. Of course, the fact that they actually give some info about each car they're building, along with mentioning what the cars are that pull into the lot, certainly gives it some educational merit.
Now, did anyone watch the Car Warriors show on SPEED last wednesday? That was an interesting show. If you haven't, two teams have 72 hours to build up identical cars, and the winning team keeps both cars. They don't have to worry about a budget either, which allows for better results IMO. Also, the teams are the "pros" versus the "average guys", so it gives a bit of twist.