Help me understand compliance!

If you have a heavy tonearm you want a stylist system that can handle the mass of the tonearm. Or if you have a light tonearm you want one that moves easily. Compliance is just a way to match the tonearm weight for best performance.  

The RB-600 is a  medium mass tonearm at 11.5 grams. This article explains cartridge and tonearm matching.
https://www.gcaudio.com/tips-tricks/tonearm-cartridge-compatability/
You can use this calculator to give you an idea of what cartridge will work with that tonearm.
http://www.mh-audio.nl/Calculators/RF.html

Read this article first, it's not that easy! 

Believe it or not there once was a time I believed in all that same nonsense. It took years to understand what a waste of time it was learning all that stuff. Now I know to buy a good arm, and buy a good cartridge, and that in both cases "good" is determined entirely by how they sound. Could not even begin to tell you the mass, compliance, or any of that about my last two arms and last three cartridges. What I can tell you though is what really matters: they were medium output, .4mV to .7mV, which made them real easy to match up with a phono stage. 

So the one thing that I know matters, output, is the one thing you're not asking about. And the one thing you are asking about, compliance, is the one thing I know does not matter.

Situation normal.

Oh and if you want a good stylist, I recommend Gene Juarez.