Having played on all "genereations" - PS3, PS4 and PC - I have to say, that ATM the PS4 is the best place to play it online... On PC, players communicate much less and do ragequit more often during heists, resetting the progress of the rest of the team.
Now that might get better, as the PC crowd in general has less experience with GTA:O, but still, right now it's very frustrating to play online.
Finally downloaded the game and I'm surprised it actually works on my machine which is an Acer laptop with i3-3110M 2.4 GHz processor, NVIDIA GeForce 730M 2GB graphics card and 6 GB of RAM... I'm not the graphics geek on games so it only runs on Medium settings with 30 FPS, but that's enough for me to enjoy the game
Actually no. It runs fine although sometimes textures seems not to load on time and the game crashes sometimes as well, but I suspect that it is mostly because I did not bought the game - just downloaded from torrents to be sure if the game runs at all and is worth buying when I'll have funds to spend.
About Vsync - it is On (not on Half).
And yes, I'm playing if Offline mode - dunno about Online because there won't be a crack for that for a long time, if at all...