Well, in the end I didn't make the switch with the guy. He didn't even try it out. The day after he took it home he called me asking me if he could bring it back. It didn't have enough bass for his taste....
Lucky me because I realized the 610 is better than the 410 for my taste. Loved it when I did rehearsal the other night. Getting ready for the gig on Sunday. I'm gonna be a happy bass player Sunday night. Love my 610, the only "problem" is that it's a little too big to fit easily in the car. I'll change car at this point...