This seems very well made, on par with a leather collar I own. As long as you take care of the material, I believe it will last years. It's a very beautiful restraining piece. The leather is soft and pliable and the straps are placed in such a way that it won't chafe if you don't wear it longer than a half hour or so.
With 11 holes for adjustment, this will fit almost every person out there, provided you can get this in your mouth. The entire length of the gag is 22 inches, and my head loosely measures in at 17 1/2 inches at the mouth. (I use the 6th hole in though, since I only use part of the ball in my mouth.)
The rubber doesn't have a taste and only has a slight 'bouncy ball' smell before washing. It dissipates to an extremely faint scent that you can only smell if you're huffing the ball. It also hold up to biting, not leaving any permanent indentations in the purple silencer. There's a small seam around the ball, but it's not noticeable once inside the mouth.