Hmmm.... to be honest, I have always preferred rope and cloth over handcuffs. Both of those can be pulled tighter onto the wrists then cuff, form better to the shape of the wrist, and don't have a risk of anything happening to the key (loss, breaking, falling out of reach, etc.).

However, I've not actually tried a good pair of cuffs that didn't cut into my wrists (literally) which could account for half of why I don't like them. I also find that they get in the way in some positions. All that aside, I do like seeing the marks they make if taken off before I bleed. Last time I wore them I had to go to work right they came off, and the red lasted halfway through the day...

I've not actually tried leather cuffs, but I apparently will be by the end of the month.... I can let you know what I think then, if you really want.