I can agree with everything above.
I am a Casual RPer and don't get myself mixed up in group RPs. Honestly, it's too much to work with.

A con for Free RP: lack of development. Out of laziness and boredom, I did a 1x1 RP with a Free RPer and quickly abandoned it for lack of vocab. I usually don't care about vocab if you have a long post & vice versa, but simply just saying, "he said" or "he smiled"? Srsly?

And speedposting is an amazing experience if you are in a 1x1 RP, with the only partner that's replying.