played online tonight quite a bit, for like almost 3 hours. it was a pretty good experience overall. you earn A LOT more credits online than you do single player. same with leveling up. i went up like 7 levels. now that i think about it, mabye it's not much faster, but for some reason it felt like it.
there are a few things i don't like about online though. my buddy and i had problems with the "game party" and the "xbl party". like we had trouble communicating and finally it randomly started working.
also, i'm not a huge fan of the online modes. i want to just race. we kept getting into events (that are 4 races each) where some were king of the hill and extermination. both of those modes i have no desire to ever play, they are just not fun. i'd rather be able to say i just want to race with random people. you can do it privately, but not with randoms (at least not to my knowledge).
also, has anyone had controller connectivity issues with this game? i have a lot of random disconnects where it pauses mid-race, which is okay solo, but online it messes me up bad. i tried using my other controller and had the same issue. my xb1 is probably like 15ft from where i sit too so it's not like it is far away. i might just get the plug/charge kit so i don't have to worry about it though, since i already have an extension cable USB for my joystick.
EDIT:
also, for the rewards thing from the forza app thing, i found them tonight in game. in the menu when you pause it, i think it was the social tab, it had a few new messages for me, and 1 was the credits i redeemed from the rewards thing. and i had to click on it and press A to accept it. so i accepted it and got all of the credits. just a heads up if you hadn't gotten it.
also the amazon preorder bonus i got (ferrari california) was just 0 credits in the autoshow, it wasn't just added to my garage like i had expected.