I"m not VBAC (obviously), but I start her class next weekend, so I can report back on how the overall class is.
I'm doing the 4 day summer class - it filled up VERY quickly (someone in my yoga class tried to get in, due around the same time as me, and couldn't).
Also, she's very open about her class and easy to contact...so maybe shoot her an email and see if she provide advice? She flat out told me not to take the longer class because it ended too lose to my due date, for example...