Those who used them in the Indian Wars in Florida against the Seneca seemed to like them according to reports in the "Firearms of the American West", however those who had chain or ring fires and lost hands or parts of hands or fingers probably didn't like them so much.

They were too heavy not to put the left hand out in front, so a long sleeved gauntlets would be necessary to prevent cylinder/barrel flash form burning and cutting the forearm of the shooter.

Too, when out of order, they were complicated enough to have to be sent back to Colt for repair, much like the Lightning pump-action rifles of later years.