Review (3/5): Grips so well, it doesn't want to come off!
So these are good in that they hold fine hair very well, but with that grip, as others have stated, comes the unenviable task of getting it out of the hair. You can roll it out, however that will wind any wayward hairs around it and result in a yank.
If anyone should use this, I would recommend it for someone with very fine, straight hair, not prone to any type of flyaways. Also, you'll want to make sure that you flatten down any frizz or flyaways before rolling it out over the pony. It can be done, but I'm not sure it's worth all the effort and toil.
I put it into my daughter's hair wet, with a silicone serum in it overnight. Even though her hair was sleek and still in the pony completely, the removal was problematic. I am sticking with the grippy Goody pony holders, although I am curious if they'll make design improvements, because there is potential. Her pony held well and it was super easy to put it in.