I just did my rescue in June, in PA through my NJ LDS. It was an excellent experience. I did it in my dry suit shortly after certifying in dry suit and with much fewer than 20 dives in it. I thought it was a good experience, because it served the dual purpose of learning rescue and getting comfortable in the dry suit under stressful conditions. Since I do most of my diving in NJ, all of which will be in dry suit, it also made sense to learn the skills in the gear I’ll actually be in if I ever need to deploy them.
While task loading and unfamiliarity may seem like a negative, I thought they were actually a plus, because they helped simulate a fraction of the stress of a real rescue. The only downside to me was that we spent significant time above water so I soaked my undergarment in sweat.
I would say it really comes down to your appetite for “adventure”. If you want a comfortable, controlled environment in which to focus on the skills, doing it as a new dry suit diver won’t be fun. If you like to push the envelope and see value in a little adversity in a well supervised and safe setting, it’s a rare opportunity to get that.