I did it almost 10 years ago and I thought it was worth it. I got so much seat time I ended up being worn out before it was formally ending. I learned a lot and advanced in the subsequent few years more than I would have otherwise. I liked how, at the end, you essentially compete against the instructors, with them beating your times, but only slightly (ie within reach). Having hope of beating theirs was an interesting motivator to do just a little better each time. I don’t recall any negatives.
