Hey X its me O,
Can't comment on the RNP, but I use the sytek and like it for very traditional classical stuff- vocals/piano, and straight ahead jazz stuff/ vocal/piano/ some acoustic bass/ some OH drums- I've only used it a few times for anything other than voice/piano so all I can say is that it did the job on the others but hasn't been road tested to where I can make a resounding endorsement - yet.
Very clean without color. I almost always use it with a mic that has a pad because there's not a lot of headroom for large dynamic contrasts.
The model I have has the Burr Brown on 3 and 4 and I'm pleased with it using an AKG 414 and Crown PZMs.
My understanding (never used) from reading is that the RNP is a more colored pre than the sytek.