I looked at quite a few OTTBs before I found Lena, (she's just a TB cross) and I recently bought an OTTB, Gracie, about a month ago! Gracie is the coolest horse- so much personality! She's athletic, intelligent, and ornery! Gracie raced as a 2 year old a few times and she's 4 and a half now, so I've only run into the "taking off" problem once- and that was 100% my fault so I don't even count it as happening. As for other OTTB vices, I THINK she cribs a little bit, (I noticed some chunks out of the wood missing in her stall the other day) but she's not destroying anything- yet. Other than that, Gracie just gets super nervous when she's alone in the barn without any of her friends and paces around in the cross ties, but that's more of her being a youngster than an OTTB. Other than that, she's the most laid back thoroughbred at my barn, even compared to the unraced ones! OTTBs have this stereotype of being hyper, but a good majority are pretty chill horses!