I almost prefer first class with no stops vs. a PJ. Those tiny ass airplanes can make for some bumpy rides! As someone who already hates turbulence, those little planes don't help.
Never been in one, cannot verify. Didn't even know they cruised that high. Anyhow, a typical Citation X say from Denver to SLC is one hell of a bumpy ride over the rockies, luckily its a very short flight.
Citation X is kind of a special case; for that route, I'd probably go with a turboprop except for "ramp appeal" and maybe in-flight noise. Citation X is exactly the wrong aircraft for that run, unless you are repositioning it or need it for later, or own it; it's the wrong choice to charter really for super short runs where it's all climbing and descending over mountains.