I bought six one summer for my kids to work with. The horses were all from the 3 time loser program, where they'd been offered for auction at least 3 times with no takers. They were all geldings about 7 years of age.
The kids did well with them and sold them at the end of summer for school clothes and extra curricular activities the upcoming year.
There is a wide variety of horses. Some are tall and leggy. Others short with long heads. Steep croups. Flat croups. A bit of every thing. A few curlies come through. Influences of whatever's been kicked on to, or just ended up in, the range areas.
They weren't any different than any other horse that hadn't been handled.
My strongest suggestion is to, once you've selected a few for soundness, pick from those for personality. Don't let looks sway you.