My opinion:
The best show - Probably Kidd Chris, and he probably performs best with their target demo as well. He seems to be a bit more "cutting edge" than Barsky and Roth, he mixes it up a little, and his "i don't give a s&$# if anyone listens" attitude actually draws in some listeners. I'm personally not a huge fan, but some of the stuff he talks about, and his presentation of his material makes me laugh out loud here and there. I was shocked to find out that my father-in-law, in his early 50's, listens to Kidd's show. He usually listens to XTU & MGK.
I feel Roth is the worst, he seems to struggle, is often unlistenable, and seems clueless when a skit or segment is not going anywhere. As far as target demo, I feel he performs worst here also, I don't think he is sure who his target demo is supposed to be. I don't find him appealing to my age group (approaching mid 30's), and I was a HUGE VH fan, he seems out of touch with the younger generation(s), and I have no clue if he is appealing to the 40 and 50 year olds. I've tried listening on several occassions, even this morning with MMR doing the Best of P & S, and I just don't get it.
I know its only been a short time for FREE fm, and with time, they could improve and find a sizeable core audience, but in this day and age, with terrestrial radio, CBS may not give the format much more time.