I bought my car from VOB and it was a good experience. I think it all depends on who you deal with. My sales person's name was Nan and she was a pleasure to deal with, very attentative and responsive starting from my first contact with her. She's been there something like 15 yrs. On the other hand I have heard nothing but bad reviews regarding their service.
I dealt with Tischer too when I was shopping for a car, nice people over there. There service dept is suppose to be very good.