About the radio stations, I find some of the stations' music choices to be quite... bizarre.
It's strange to hear Steve Winwood's "Higher Love" on Los Santos Rock Radio, then have Def Leppard's "Photograph" play right after (which for me happens quite frequently). There's a massive difference between rock and pop. Now to mix rock and metal isn't too baffling as both genres have many similarities. But to have such soft music on a rock station is a headscratching decision. Some AC/DC, Steppenwolf, Pink Floyd, The Rolling Stones, and even Aerosmith wouldn't hurt at all.
What really bothers me is Non Stop Pop FM, which as formerly mentioned is having more songs recorded for it. But there's so much confusion with having Hall & Oates play, followed by Rihanna, followed by Wham!, then Britney Spears. It's like they put every pop song made since the 80's each on paper, into a bucket, and picked out 16 random songs.
Then Soulwax FM which has techno and electronica all the way from the 70's to today. Strange to hear a song from 1979 mixed into a radio station dominated by house music made over the past few years. Worldwide FM is also strange with Jazz music thrown into a world music station.
The other stations are alright with their choices. Maybe some more songs could have been added to Vinewood Boulevard Radio and Channel X to lengthen them a bit.