I agree that the higher end Bernina, with BSR, etc, is a wonderful thing to have, and the price sounds great.
The only thing that would give me pause -- most people when they upgrade will trade in their older model to the dealer -- often the dealers make that a very attractive way to do the deal. So someone selling independently, hmmmm -- I would just want to have it well checked out by the dealer of your choice.
As for the classes and instruction -- I think you can get a lot of good input online with videos and tutorials and information from the Bernina website. It can be really helpful to have hands-on input when you run into problems, but that's not essential, assuming that the machine is working in prime condition. The BSR is one of those things that takes some getting used to. A huge percentage of the "problems" are user-error, and are sometimes hard to figure out what you're doing wrong without an outside set of eyes. If you have someone in your area who is experienced in using it, make friends and hang out a few times to get a feel for what it looks like working right.
RST