I love the Nettles Halfbreeds I buy from RockyRoad. My sister had to have both knees replaced and before she had them done, the Nettles were the only stirrups she could ride in without pain. All of the other ones she would have to kick her feet out of her stirrups after about 10 minutes of riding.
It's also nice not to knock your shins when you are carrying your saddle.