actually, yeah... I do. there were a couple times in my weight loss that I took the diet and excersice too far to the extreme. I'm sure if I had put a heavy concentration on maintaining muscle to help fill the skin out I wouldn't have so much of a problem. Also I lost on average 2.5 pounds per week, but that doesn't factor in the month long plateaus I would go through... when I was actually losing weight, I would lose upwards of 3-3.5 pounds per week, which is well above the cautionary 1-2 pounds given by most professionals.
But then again, I also lost about 140 lbs. Most professionals say that you won't have much lose skin if you only have enough about 100 pounds to lose, so I had my shear amount of fat playing against my favor.
So yeah, take my tale as a cautionary one if it helps. If I could do things over again, I would have concentrated more on bf%, then the number on the scale. However, I have no regrets. Taking into account the mental state I was at the time, I wanted to get that fat off as soon as possible. I did it, but I have to pay for it as well.