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So I'm at level 91. I've completed the Modern Tour and the Legacy Tour and now I'm working on the Enthusiasts Tour. There is also another one of those limited time tours available which I'll jump into as soon as finish the Track Specials events which I'm doing in a Holden
I've found that I really don't like the Rivals events, not just that I'm not good at them

I'm really impressed with the weather effects. I was just running a race at Grand Oaks which started off with just a light rain. After several laps suddenly the light rain turned into a downpour and since I'm on stock tires I didn't have an option to switch to rain tires in the pits. It became like driving on ice and I had to use Rewind a few times just to finish. Of course I didn't notice any of the AI cars going to the pits either to switch to rain tires. I'll have to be careful to save a replay of any race where that happens again and see if there are AI cars pitting.
The Difficulty setting works OK for the most part, but at certain tracks the level four difficultly I'm running which normally keeps the races pretty tight just doesn't work that well. This is true especially at high speed tracks like Le Mans in the old configuration with the three mile long straight. I was gaining ten seconds a lap on the fastest of the AI cars. Maybe the devs will address this in a patch.
Forty hours played and no problems at all so far, except that issues early on with frame rate at Ultra on the Laguna Seca track. Now that I've switched to High graphics the game stays pretty steadily at 60 fps almost all the time.