I have not bought from Seattle Coffee Gear, but I have bought numerous times from Chris Coffee and I can tell you they are really top notch shop.
Oh, wait -- someone already said that . . .
Seriously, I have never purchased anything from SCG. I'm not avoiding them; I just haven't needed to avail myself of their services. As such, I cannot say anything about them one way or the other . . .
On the other hand, I have repeatedly made purchases from Chris' Coffee Service, including espresso machines, grinders, and various parts and equipment. They have always been helpful, both before and after the sale, and I've never had any reason to complain or be anything less than completely satisfied with their advice both before and after the sale.
I have no connection with Chris', other than as a satisfied customer, and they remain one of my "go to" vendors.
Cheers,
Jason