The Anita is fairly well regarded, and the next step up in consistency and flavor delivery from your current machine. The fact that it comes with erics' grouphead thermometer is a big plus for you (being new to HXs, this thing is the best for teaching you how to flush to different temps consistently). As far as the HX vs. DB
argum debate goes, you would do well to read the
HX Love article. If your friend is local, you should definitely go to his place, armed with some fresh coffee and your B-Vario, and test it out.
Evaluating price is always difficult. Buying from a friend may complicate the matter even more. Caveat emptor, depending on how much of a friend he is and how knowledgeable he is about the machine

. Given that the price for a new Anita hovers around $1600 USD, his offer may be acceptable. Consider his maintenance schedule (descaling, backflushing, replacing wear parts like grouphead gaskets) and the water that was used.
Your dog wants espresso.
LMWDP #288