I finished the game yesterday after 40hrs or so but the game update earlier in the week messed up my game making it impossible for me to get 100% completion.
I really enjoyed the game and some of the heists were amazing, it is also the first GTA I have ever finished despite playing every game in the series. By the end of the game I'd made 350million dollars on the stocks!
I haven't played it online as didn't want to risk my sp game getting bugged, which it did anyway!
I'm now going to ebay the game with the preorder DLC if anyone is interested in buying send me a PM!
If the rumor of a next gen version is true I'll pick it up again for PS4 and go for the 100%.
Outstanding game, easy 9/10 and that's just for single player!
-Edit-
A new title update for the PS3 mp has just gone live. 360 should be 'soon'.