Two types of NHC
There's the European version where the dealer gets no hole card and you lose splits and doubles if he gets blackjack. This is a very disadvantageous rule for the player and you want to avoid splits and DD against an Ace or ten value card in most situations.
Then there's the Puerto Rican version where the dealer gets no hole card and you keep DD and split wagers if he has blackjack. In PR you also get early surrender against a 10 in several casinos, and this is an extremely advantageous rule for the player! In fact I'm going to be playing there in a few weeks and looking forward to emptying their chip trays.