Unfortunately, I cannot go to the current two RxPrep live offerings due to rotations - but they will have more scheduled and am absolutely going.
I have heard great things about the live courses (from folks who had already been studying with the RxPrep course). The feedback I have heard is from people who have tested in the last two years - and to sum it up, it was pretty much something they *could* have done on their own, but likely would not have. It is a solid review, gave some clarification to areas - as well as some focus to others.
The people I know (twelve people in total) all passed on their first NAPLEX attempt.
I figure it is better to be too prepared (than under-prepared). Hope this helps - good luck!