A Rohm keyless chuck is the bomb
I think I am going to have to jump in here with a competing opinion. At the suggestion of Bob Avery, I purchased a Rohm keyless chuck for my Sioux drill and it has functioned perfectly. It is easy to operate and has never backed off. Also, you do not need a reverse feature. If you ever need to back out a stuck bit (which rarely happens), you can manually spin the chuck and there is no problem with the chuck backing off and the bit falling out. After changing bits about a jillion times, the Rohm chuck has been a real time saver. See Avery tools.