I went to the BMW Performance center in Greer. Rawhyde looks fun, but too far away at that time.
Wear something lightweight (long sleeved Klim has a couple of good enduro style shirts with padding, I wish I had them) and boots with good support. Don't over dress, the heat and activity, seriously, light weight gear and gloves will do unless it's the beginning of spring or late fall. You do need fair knee padding although you'd really have to f*ck up to get hurt (and by that I mean doing really stupid shit).
You'll be standing on pegs most of the time. Don't wear touring style boots. You really want to rent their bike. Everyone drops a bike, some more than others. A good ADV helmet is preferable since they breath more than a regular helmet. A regular helmet will smell horrible at the end of one day, trust me.
The entire team was very professional and highly skilled. You'll spend time on exercise by show and tell, then several iterations of the task following by breaks, drink plenty of water, stretch a bit. You'll move to the next task by going on enduro (trail rides). A few hills are quite large, don't be intimidated by them, motor through it. Peer pressure helped me
Nobody got injured, one person freaked out and left on day 1, I assume he wasn't really mentally prepped and it wasn't really that difficult a task (triple mogul hills about waist high.) Nobody forces anyone to do anything, but you'll want to do everything. It's more of a mental challenge that requires being comfortable on the bike. You'll get that level of comfort. From my personal experience I was amazed at what I could do on the bike and what the bike could do. It really boosts your confidence. Confidence is 80 percent of the tasks. I'd like to go back at some point as a refresh.
You will be tired at the end of the day. Wouldn't recommend drinking a few beers after day one, you pass the hell out, wait to the 2nd day is over. I was in fairly good shape and you'll get tired for sure.
I'm sure either course is worth the time and price. It's money well spent. And the lunches are quite good in Greer.
Greer has a BMW Museum, gift shop discount (BMWMOA Members) and I think a factory tour.
Also, if you are a BMW MOA member you can apply for the "Paul B. Scholarship" at least 3 months out and get a $250 discount after completion.