dudes, renderman is extremely usable after learning RSL.
It is really amazing, you may write your OWN shader with lots of AOV so you can comp it later. Not only the AOV's do the magic work, but the renderman like renderer itself. It like learning to drive a F-1 sport car, or something like that.
I think renderman like renderers are not BIG studio oriented only, it also does good job for small studios same as for "1-man studio".
same as bnvm
started learning and can't stop