I doubt I lost 1000 feet doing it, but it was an eye-opener. If you're at 4500 feet, try it. As soon as you're flying backwards, pop those toggles and hang on. It will give you a lot of insight into what's going to happen if you decide you have flared too high and release your toggles on landing. I actually have a jump where I did a stall and popped the toggles on video. The first time, it scared the hell out of me, I didn't think that 210 boat could move that fast. It's a good thing to know, just make sure you're up high.
I bet when it was all over, the guy had a "pant malfunction". I could look over the top of my PD-210 after a full "bowtie" stall. 500 ft., huh? Real smart.
There's a DZ at Packinham that I jumped at a couple of years ago. It was pretty laid-back and seemed to be running a decent student program. I know I had a good time.