Never experimented RC stims, but have with Diclazepam (2mg pellets from some UK vendor, forget name).
Had been going through serious withdraws from a month or so of daily Clonazolam usage (.7 to 1.4 mg a day) and got the Diclazepam cause it has a hell of a half-life, so it was easy to taper. My w/d's were pretty serious and unexpected. Severe muscle cramping / tension / pain, 1 or 2 mild seizures while sleeping (bit my tongue pretty bad on one of them and kicked over a tv next to my bed).
The diclazepam wasn't really that noticeable while tapering over 3 weeks (started at 3mg, and then dosed every other/third day--depending on whether w/d came back--with 2mg at first).
Later on after I had been off all benzos / analogues for a few months I tried the diclazepam a few more times. It had a slight calming effect, but it was really no big deal (at 2mg). Note that I was also taking an rx of 40mg / day of Adderall at this time.
However, take this with a grain of salt as I would say benzos overall usually have that "no big deal" feeling for me (which I know sounds ridiculous as I had been physically addicted at one point). I will say that that w/d was very unexpected and I can't even say why I was using them that much. It was probably just boredom and that they were there so I popped them. I had abused rx xanax and klonopin in the past in binges but never really felt any w/d so this Clonazolam w/d was both scary and unexpected. When taking xanax I would generally do 2 bars and 2 beers (4mg) and would basically just black out. With klonopin I would take 0.5 to 1mg a day more functionally.
Respect the RC benzos. Clearly some of them are hella potent and GABA reset is a real fucking beast (can kill you).