i have been buying these for a while, but i think i'm going to look for something new.  I find that these do tend to pull a bit of hair out for me as well. 

They are also slightly off in size for the width of my ponytail: if I wrap it twice it's too loose and starts falling, but if I wrap it thrice it's way too tight.  If you are very concerned about losing a few hairs when you take it out, be warned.  also, if you have very thick hair like mine, the diameter(?) might give you some problems too.

also, they are incredibly delicious to cats, so keep them in a drawer or out of reach.