I've been very pleased with it. My horse loves it, he looks good on it & it's helped get some weight off him. Amazingly he was sane & safe to get back on after 6 weeks off work! If, when he's back in full work, I feel he needs a little bit more I'll definately be looking at the Comprehensive Balancer in the hope of getting the same results but with a few more calories.
We feed the Anti Lam too and our horses look great on it. One of them in particular is on a restricted diet - grazing muzzle, soaked hay at night etc. The Anti Lam makes sure he's getting all his vits and mins without piling on the pounds.