It was awesome! I was super lucky to have been working out for the last few months with the stability ball, as lots of the movements are similar and require a generally good level of balance. Phew! She signed me up for an intensive TRX package so now it looks like I'll be going a few times a week for the next three weeks. I'm hoping to find ways to incorporate some of these exercises into stuff I already do, considering that the equipment seems to be as simple as bands/ropes with a handle. I could handle that! (HAaaaaaaaaaa)
The instructor was totally approachable, the classmates were fun and modest and normal people, and -- in the best way -- I left thinking "....pffft, I could totally be a fitness instructor". The instructor didn't even have to join us for the exercises (which is fine because she was helping students with their form) but hey... if I could make money by putting together movement series' and telling people how to do them, then, well, I'd be making money doing something I already do!
Here's an example of some slightly more advanced TRX stuff.