So I'm new to the board and have only had my guy for 5 months, but he gets smartpaks, is a little picky and here's what I've found. He started on Smartlytes, Life Data's Barn Bag, and Smartlamina. He was eating that fine, but at the time I got him I had two full sized horses I don't have anymore. Feeding the three of them was kind of a hassle because my barn space wasn't really set up for more than two horses. At some point I changed feeds and decided to put him on the same brand of feed as the horses. I took him off of the barn bag and found the smarthoof supplement was cheaper than the smartlamina and the ingredients seemed fine to me. He hasn't had any problems since I got him and I wasn't told of any problems he has had in the past so I was really just looking for a maintenance hoof supplement. He wouldn't eat the smarthoof supplements and I noticed he was a little more tender on the gravel drive ways on our road when we went out for our walks. I switched him back to the smartlamina and he seems to do much better on it. Around the time I switched him back I also decided to try out smartcalm because he can be pretty flighty and skittish. While he's still not a deadhead like some of the stock type horses I grew up with it does seem to help him keep his cool enough to think through things rather than reacting first. So now we're on smartlytes, smartlamina, and smartcalm in custom dosages for his average weight. I also found that he flat out refused SandClear. He loves smartpak's psyllium pellets. I put him on a subscription for that too so every month I get a box with 7 packages of psyllium pellets in his dosage and just pop it in his AM drawer and add them to his feed (MannaPro Safe Performance) with his AM smartpak (I have his smartpaks divided into half dosages AM and PM just to make him think he gets more feed than he actually does (the minimum amount of feed for his weight and work load). All of that to say I found it just took a bit of playing around to find which supplements my liked. I think a lot of that is just personal preference on the animal's part.