I've had a New Frontier 6" for many years. It IS prettier than a Single Six, but shoots about like my 6 1/2" "Liberty" Single Six, except that for some reason it REALLY likes .22 WRF better than .22WRM (one of my Smith .22WRMs does too).
But I shoot my Single Six a LOT more than the Colt 1) because the Colt was in near-mint condition and my SS was somewhat comfortably worn when I got it, 2) because the SS is easier to fix and can safely carry 6 shots, and 3) the sights on the SS are sturdier. The Colt's .22LR cylinder has never been fired nor fitted; it came virgin and I've left it that way--I mostly shoot .22WRM in these guns anyway.
BTW, my brother has a mint unfired 4 3/4" New Frontier that came with the WRM cylinder having only five chambers cut. Now there's a "safety measure": "load one, skip the one you couldn't load anyway, load four, let the hammer down on the chamber that isn't there"! Colt quality control of the 1970s.....
Neither of our New Frontiers has the later Mickey Mouse hammer block safety.