I have heard that many of the Boon Bar horses are tricky and hard to train, not sure though as I have never messed with one. However, we have a local stud named Lena Fajita (Lena Fajita Quarter Horse
) that the majority of his get are very hard to train. Spooky, broncy, and quick to bolt. However, once you get them trained, you won't find a more solid horse anywhere. Of course, there are exceptions. My brother bred his Mr San Peppy mare to him about 10 years ago and as a 3 year old, that colt was virtually bombproof. He never offered to misbehave at all. My dad's horse Pokey is out of a Lena Fajita mare and OMG, he was a monster to get broke. Dad's been using him for about 3 years and he is just now kinda starting to relax and mellow out a little bit.
I adore the Two Eyed Jack lines. The 2 of them that I had experience with were very laid back and easy going, if a bit lazy. Not stubborn but a long way from being energetic.