I had one in my old daily driven ZR2 blazer 10 years ago and I HATED IT!!
The no-slip looks interesting because it has springs to help with engagement but any of them without springs uses torque to keep them engaged. This is a problem because if you drive like Kenny previously said he does, going around a corner fast from a stop they clunk VIOLENTLY! Your forced to let off the gas to let them slip less violent.
That part could be manageable depending on your driving and if its your daily or not BUT...
Worse yet, if you live in a cold climate, if you go around a corner too slow OR to fast you loose both rear wheels. I've been stuck in the middle of the road with traffic behind me needing to go from drive to park to reverse to drive then back to park back to reverse and back to drive multiple times until they finally re-engaged. This was with all sorts of different fluids trying to remedy the problem with no success. But again, this only happened in colder weather starting at around 40F and getting worse as it got colder.
So speaking from experience, avoid the lunchboxes like the plague if its your daily AND your in a cold climate. Otherwise take this as it is and use your judgement if you want to deal with the downfalls to benefit from the positives.