I own and compete in penning and sorting on a gelding sired by Elans Playboy and also know of another gelding that was competing in WCH. From what I have heard about the other gelding, these two are total opposites. I was told that it really does depend on the mare's bloodlines as to the temperment you will get.
Fred, my gelding I would not ever consider for reining. He is hot and all go, carries his head naturally a bit higher. Could he do a reining pattern, for sure. But knowing him he would find it boring and start to crowhop. He is also a very moody strongwilled horse. But I love him and he does fantastic at what he does. I have won two saddles competing on him plus lots of other stuff. This year a couple of friends are competing on him and doing very well.
The other gelding was doing very well in WCH but was more laid back and easy going.