My one mare is a hard keeper. When we got her she was severely malnourished. As a result, she had rainrot, ulcers, and had began windsucking. She is also 17 and had terrible teeth. The vet has come out, floated her teeth, and has given her the okay. I've been keeping her on some U-guard and it has been working, but I saw today that smartpaks has a new program starting up for their SmartDigest supplement. It would cost me $34.95 for a 28 day supply, but they also cover up to $7500 of colic surgery coverage. My mare meets all of their requirements and since she is more likely to have colic than my other horse due to her windsucking (collars didn't work), I thought it might be a good idea to get her on that supplement as well. Smartpak also has my normal supplement, so I could just buy them together then. Any thoughts on this program? Is it worth the money? Have any of you used smartpak?