I use it, but I haven't used anything else to compare it too. It seems to work and I am happy with it..... well lets put it this way the horse is moving well and seems comfortable on it so who am I to argue
ive used quite a few joint supps-cortaflex,blue chip and topspec.
have to say none really seems to make the horse move any differently, apart from one mare who hotted up on them and went bonkers lol.
i feed it to youngster though to help prevent problems.not really sure it makes much difference.