I got OneKnob Louder or whatever a year or 2 back when it was free. I tried it once and never touched it again. Don't see the point of these OneKnob things aside from being a sort-of "gateway" for the new guys to get sucked into the more expensive Waves stuff.
"OneKnob Pumper simulates sidechain compression, saving you the need to route the kick track to the sidechain input of a compressor. IT’S DUCKIN’ AWESOME!"
Hands down the worst free plug they have given away.
Rbass was ok, louder was shit and audio track was probably the most useful/best (actually I can't remember if I bought that stupid cheap or they gave it away).