An additional point to consider, along with what the other posters have mentioned:
This horse is *fit* - she was conditioned to do a 25 mile ride recently.
So if you're looking for a horse to amble down the trail while you gossip with a friend, this is probably not the right horse for you.
Everything about that video indicates that the owner put quantity time in her; both time on the ground work and time in the saddle - do you have that kind of time? What kind of horse will you have if you don't put that kind of time in her?
I can absolutely see why you'd want her, but I think you need to do a very realistic evaluation of what you want in a horse, and the kind of time you can spend in the saddle.