I use them. My 5 yo came up lame a couple months ago, RIGHT after I actually got my policy (within a month). Turns out he has Navicular and a collateral ligament injury. Vet wanted an MRI, which they covered part of. For the $5000+ I’ve spent so far (initial lameness exam, x-rays, MRI, Osphos, joint injections, shockwave), they’ve covered $2400. So it’s helpful, but not awesome. They will not cover joint injections at all, and they only cover a small portion of the Osphos.
Honestly, I was expecting them to deny everything. The ONLY thing that saved me was that right when I applied for a policy, I got the vet to come out and do a lameness and neuro exam on my gelding. A friend’s horse had been put down recently due to a neurological issue, which was discover when her horse tripped and fell… and mine had tripped and fallen twice, so I freaked out. The vet said he was 100% sound and neurologically fine. That report was the only reason Markel is paying me now, I’m sure.