444,
Unfortunately, I have no experience with chromed BCGs and am not claiming that they are better, just that they might be. And, by everything I have read over on AR15.com by people that know infinitely more on the subject than I do, I think they are worth looking into. One problem that they seem to help improve is reliability after firing LOTS and LOTS of rounds. Personally, I doubt I will ever in my life fire anough ammo between cleanings to justify a chrome BCG, but then again, I doubt that I will ever need a BUIS in a match or a SD situation, but I have one anyway. Never hurts to have the best.