Yes, I've been using it for about 5 years (it was called born to win previously), it helped my spotted saddle horse gelding who was an easy keeper immensely. Changed him from a lazy guy back to his former energetic self.
Also, both geldings needed only a small amount of grain daily, and the feed store man explained that a regular 12% pellet such as Horsemans Edge is formulated to provide the needed daily vitamins only when fed the recommended amount on the bag (ie 1 to 1&1/2 scoops am & pm), so that by feeding less than that I wasn't actually giving them enough to provide the neccessary vitamins. He explained that Enrich 32 is actually a supplement in pelleted form, that provides everything they need in a small amount, only 1 pound a day for their size would give them what they need vitamin wise.
I am interested in the opinions of others, so will be watching for other replies.