If you can get it for a few hundred, grab it quick. What model is it do you know? I have a 930 Bernina that I have had since 1985, and have never yet had a problem with it. I love it. I switch between it and my featherweights for sewing blocks. I use my Bernina for heavy sewing. GREAT machine in my opinion. I have only had Singer and Bernina, so I can't speak for other machines. I have my Mother's old Singer Dressmaker machine, she bought in 1941 or 1942, it was used at the time, that I learned to sew on and a Singer Golden Touch I bought in 1968, and loved sewing on it, until I bought my Bernina.
I would definitely say buy that machine, and if they are offering you lessons on it great. Sounds like you can't go wrong on this deal.