I ended up selling this unit…. but the J-KO Mat Cleaner is really pretty nice. All stainless steel.
Only difference between the BB-4 and the BB-X is the GinSan GS-11 timer (standard vacuum timer – non-accumulating) and the front buttons. Well also the case has some places for locks and there is a shield for the mat return. But you could compare the pictures I have. I guess there are a couple differences? 🙂