I have two both wild captures, both outstanding mounts, riding, roping, castration, and vaccination are their areas of expertise, easy keepers, sure footed, and can move like mountain lions, always the first to the gate and genuinely get upset when not chosen for a job mine will pace the pen all day, never have health issues not even the first sign of a collic
BUTTT.... Getting there can be a big deal most of these guys are rounded up by helicopter, run through squeeze chutes, clamped, flipped, feet are done by electric grinders, flipped back up, freeze branded and run onto trailers like wild cattle, so there's no warm and fuzzy feeling on their part by the time they get to you for human beings, scared s##tless about sums it up pretty well.
Handling facilities are a big deal the last one I got tried jumping a 12 foot wall for no other reason than I stepped into the room and knocked herself out cold having somewhere to work where you and the horse can be kept free from injury is important.
I'd work 10 feral horses over 1 cuddled pony or a Jenny mule with a sour attitude any day.
If You don't want to do everything yourself from start to finish go to the mustang heritage foundation website and look at the TIP program for help finding a already gentled horse they'll be cheap and still need work but these animals should be halter broke, lead, step on and off a trailer, and you should be able to handle and trim their hooves which is a good place to start for any horse of any breed.