We've used TVH for my horse since I bought him 4 years ago. One of the vets did a very thorough vet-check before we purchased him, but I've always found him to be a little on the blunt side. While I do appreciate the brutal honesty, I did not really appreciate the way that I was spoken to.
A year or so in, my guy went lame and we requested that the next available vet come out ASAP and she informed me that at the good old age of 5, my horse was developing arthritis. (We later found out that he was lame due to a poor job by the farrier).
As of recently, we've been using another of their vets and I will only deal with him. He is prompt at returning phone calls and coming out to the barn asap if there is an issue. If I do have an issue, I call his cell and don't really deal with the front office so I can't speak for them or the building itself.
My biggest issue is the prices. I think the minimum farm call is $80+ (I haven't had them out in a while so I don't really remember), but I don't have anything else to compare it to and with all of the gas just to get to their office to my farm, I can't complain too much.