I would certainly go and talk to him. That is a very expensive machine, and $600 seems like a very good price.
Is it the fact that it has a chip that you don't like, or the sewing?
If it is the sewing, perhaps he can help you with that.
If it is the chip that really bothers you, well it would depend on where it is. I have little decals all over my machine, because I wanted it to be my own.
I am looking to replace mine though soon, but I will take all my decals off and put them on my new machine. I was actually considering the machine you purchased. So I would be interested in hearing what it is you do not like really about it.