They are a better amp than a Sony/Pioneer/Clarion, but not real high end. I would check ebay before you buy at your local shop. Those amps tend to be marked up much higher than they need to be. They look real nice, so I think most people assume they are much nicer amps than they really are and the shops make a strong profit on them.
I have heard they are not very dependable and tend to get blown. Check some of the review boards on car amps and you will see what I am talking about. For the money, there are much nicer amps out there. Check out
www.thezeb.com or
www.sounddomain.com. There are some great deals, they come with factory warranties, and you will get a much higher quality amp than the Audiobahn amps for the money. For instance, check out the Hifonics amps at the zeb. They are at a great price right now and the specs are better.