I've heard alot about the springer, not all good. Now I'm not saying it's bad or anything, this is just what I heard.
I really like the bikerdog, it is wonderful. Roxey & I have never had an accident, she's never pulled me over (and belive me, she's tried when she sees other dogs ) or gotten the bike out of control.
I highly recomend the bikerdog. I paid $55 with s & h, and it has been worth every penny.