I will say this. I got lucky! He is the most easy going, willing to please horse I have ever had. He has struggles, completely one sided, still detoxing off the drugs. Not sure that he really represents the typical OTTB since he is soo calm. He struggles to canter and has needed a lot of massage therapy to balance his body and release a lot of stiffness and he is only 5 yrs with about 37 race starts.
If you ride under a trainer they can be a blessing. Personally I would reccommend New Vocations if you're considering an OTTB. The do the vet check, get them healthy and get them started off nicely and under saddle. Then they adopt them out for $200-$1000. They are very well priced and they do all the hardest work. If you want the link I can post it.