Hey Steely, plants are all looking very nice bro! I need to get some of those ABB, I have read so many positive reports here. As for your NLxBB, I have grown one of those plants before. They are very slow starters and slow to flower. Mine got quite tall, if memory serves me correct, about 30". The buds get very dense, are plentiful and take on a vanilla smell. The high wasn't so impressive but I had to pull mine early due to bud rot setting in on the main cola. Keep an eye on RH levels and an even closer eye on those buds. Make sure you have a lot of air circulation.
Good luck with 'em. I am sure you will do great!