Hi, I think that Mike nailed it, the Colt open top is an extension of the hand. I think the open top Colts are also more accurate than other designs in that the Colt has a longer sight radius. Besides being extremely functional, the open tops are beautiful revolvers. Fernando Lamas once said, "It is better to look good than to feel good." I think that when you look good, you feel good. Colt's sure do.
Regards,
Richard