I am using it this year for the first time and I have been really impressed. It has stopped my mare itching on all but the hottest of days and I have noticed that we have got a full mane and tail this year. I don't use fly spray at all really except for a bit of Red Horse Ear Balm on her face and it is so much quicker to put a tablespoon of supplement in her feed (it's pelleted, so you can feed by hand too) than do the whole fly spray/fly mask/SI rug performance.
It is pricy but if you can get a free palatability sample if you contact the company and also I think if you sign up to their mailing list you get 10% off. Also, if you consider how much you spend on lotions and potions, it probably adds up to about the same amount per month.
I don't think every supplement works for every horse but I have been really impressed with this one.
No problem at all, I totally agree. I had tried a few others with no success but saw some good reviews on FB and thought that I would give it a go, happily it has worked really well for us.