I did a swap of a 6 yr old race bred quarter horse gelding for an 8yr old quarter horse mare. Best thing I ever did. The owner of the mare wanted something taller( she is just barely 14.2) and the gelding was too big, (close to 16 hands). The mare is relaxed and easy to work with both on the ground and in the saddle, the gelding was wanting to run and go fast all the time.
I am past the age of wanting to run fast, he was too much horse to deal with everyday, I wanted something settled down and well trained.
We traded and both got what we wanted, a nice calm well trained horse for me, and a high end speed type horse for roping for him.
I am not sorry I did the trade, it could not have worked out better for either of us. Plus I got a true blue roan color thrown in for the icing on the cake.