I love retics but I just don't have room for a 15-19 foot snake. So I picked up a pure super dwarf kalatoa retic in 2014 from Travis Kubes.
She is awesome but feisty. She may not ever be a giant snake but she is still a serious girl. At two and a half years old she is 1300 grams with a body much more like a bull snake or a rat snake than a python. Long and slender rather than short and chunky. She is immensely strong, really quick, and really smart compared to a ball python and her feeding response is impressive.
Behaviorally, she is very aware of her surroundings. I keep her in a 36" x 24" by 18" Boaphile at chest height, and she is always watching when I come into the snake room. She will even move to the front of the cage to keep watching me as I move around.
I love her activity level, she is easily the most interesting snake I have from a behavior perspective.
I also have just picked up a hatchling male pure Kalatoa. I've only had him since early in February, 2017 so I just don't know him well yet. He is tiny- 52 grams and about as thick around as Sharpy marker. He is really dark with cool rosettas down his sides.