I am with jleegriffith in that I don’t do PPEs either… but that is because I generally either know the connections and trust them, and I also have the luxury of being able to afford keeping them if they don’t work out…
Only one thing I would point out – x-raying the back is not the new cool thing to do… it is something people do after dealing with KS (or even CA) in a sport horse. Once bitten, twice shy…
I would absolutely suggest anyone who wants a long term riding horse to x-ray the neck and spine if they are doing a PPE. The reason being is that it is a common enough disease in TBs, and yes, remodeling is indicative of a problem. Some horses might be stoic enough to appear asymptomatic, but it does not mean that two intersecting or remodeled processes are not bothering the horse… OTTBs are usually young (as under 7 yrs old) and for them to have remodeling at 3 or 4 or 5 is sometimes something to consider for sport careers.
However… a PPE is only a snapshot and in no way indicative of future soundness issues. Honestly, I would bring someone extremely familiar with placing horses off of the track, someone intimately familiar with assessing soundness issues and reading into racing history; IME that can be even more valuable than a PPE, as many novice riders go to the track for a cheap prospect and don’t have the eyes or the know-how to realize their “sound” horse is lame. There are lots of warning flags and/or subtle things that can help you make a good and informed decision, and it’s invaluable if you are looking for a riding horse.
So, long paragraph short, don’t walk into this alone - take someone very experienced with you… or buy from someone who has the experience to sort the weeds from the chaff, like the poster above.