It seems that both gens well letter from Colt now and both seem to have the same value, with exceptions.
Last I heard they wouldn't letter from Colt. Colt put out a disclaimer saying they didn't build them and wouldn't warranty them and I've heard several people say they tried to get them lettered and Colt won't letter them. Colt only licensed the 3rd gens and had no part in the building. Colt at least did the final fitting and finish on the 2nd gens.
No argument from me if you like them. You like ROA's too and I wouldn't soil my hands on one but differences are what makes the world go round. It'd be a mighty dull place if we all thought exactly alike.