Anyone have any experience with sons, or grandsons of either? 

Looking to add speed, bone and keeping the level mind to a cutting mare. 

I have a son of Jody O Tool. He is the sweetest, kindest horse I own. He has everything in the world wrong with him-kissing spines, chips in his knee, a broken rib. He came off the track. He has never acted up, never refused to go into the arena, never missed a turn, has bad feet, doesn't sweat.  Works his hardest every time. BUT I think he is an exception because every other Jody O Tool I have ever been around was kind of hot. Bought mine as a 5 year old trained him retired him a few years ago because he deserved it. He is 22 now.   I won a lot of stuff on him at some really big barrel races. 

There is a local girl here who runs a son of PYC. He is a really nice horse. Big and chunky. He is fast too and lights up in a barrel run but he is a real ham when he isnt runnning LOL.  Thats the only one I know of, but if they are all like him, you can't go wrong.