the first mare is cute and game. decent mover, not a "10" but very nice overall and nice price tag for her experience. i like that she is so honest and obviously schools well XC. she tends to take a tighter spot but that can be better for eventing as long spots can cause a horse to not clear the obstacle and result in falls of rider and/or horse (just ask me about schooling my field hunter XC for the first time yest lol). she's clean, neat, talented, going in a simple snaffle of some sort, and has a good confirmation for power. she drives from behind most of the time and has a good level of engagement of the hind that makes me think she'd be a great mount to learn eventing and dressage on without a fuss. i like her a lot.
the QH i immediately say pass on. he is short-strided, lacks power and engagement and is rather shallow behind. he's built and moves more on the fore, and he is on the lighter side (i prefer foundation QH over the more TBQHs you see today). he's okay all around, not bad but not good imo, and not worth the asking price. for half the price i'd consider it, but more than that isn't worth it based on confo and movement. you want to buy more than just temperament to event. you need good temperament along with athleticism and this horse just doesn't scream "athlete" to me.
the third horse is lame. my guess is an ill-fitting saddle. shoulders are tight and forelegs lack reach to the point that his front toes are dragging (look at how he kicks up dirt in FRONT of his front feet every stride). he is false framing with no connection from poll to hind and while his head is down, the motion ends at the withers. i'm going to say the saddle is too wide, sits on the spine causing the start of the unsoundness. it's also possibly pinching the shoulders (or the horse is clenching the shoulders because he's hurting in his back). jumping you can see he trails in the hind and doesn't rock back on his haunches but rather lifts from the head and shoulder and jumps hollow because his back hurts. he has potential, but the heavy handed rider and poor saddle fit isn't helping him. i'd reconsider after a few chiro visits, a good massage, a month of longe work, and a month of trot sets to properly build muscle along topline and hind. even the confo pics now show a weak topline and overmuscled fore and underdeveloped upper hindquaters with overdeveloped thigh and forearm muscles - all a dead giveway for back pain. pass.
hope this helps!