I've owned a few of his descendants. The ones I owned were appaloosas with heavy quarter horse and thoroughbred influence. They were lovely movers and very attractive mares but their temperaments were wanting. One mare was extremely flighty and hot. I eventually had to sell her because I wanted to show her and she could not handle a show atmosphere. She would have a mental breakdown from over-stimulation. She was great to ride at home and on the trails though. The other mare was extremely aggressive and high maintenance. I could not afford to keep her in constant training so I sold her and she is now winning beginner novice cross country competitions up and down the east coast. These two mares were mother and daughter and they had Zippo Pine Bar more than a few generations back in their pedigree. They were just as much related to War Admiral as they were to Zippo Pine Bar and I'm guessing that their hot, flighty and aggressive temperaments came from the racing thoroughbred side of the family.
My dad's mare is a full niece of Zippo Pine Bar and she is a wonderful show and performance horse. She is extremely versatile and trainable. I rode her hunt seat and jumped her up to 2'6" for a few years and she did well. After that we leased her to a 4H kid who showed her in reining and western riding and won state championships in western riding with her. She was broke to drive, and was shown in dressage before we owned her. She will do upper level movements such as tempi changes. She's a phenomenal obstacle trail, showmanship, and equitation patterns horse. Now my dad is doing barrels and poles with her but he's thinking of giving English a try soon. She's just one of those wonderful jack of all trades horses. She'll do anything for you.
I've met quite a few other Zippo Pine Bar descendents over the years and they usually seem to make decent pleasure horses, though there are always exceptions. I definitely recommend giving this horse a try. Remember that the horse you're looking at has three other grandparents besides Zippo Pine Bar. You never know exactly what traits they'll inherit from each ancestor so it's best to consider each horse on its own, pedigree aside, and decide if that horse will fit your needs. Good luck in your horse search!