I play it on a daily basis (~30-40 minutes a day), but my progress is rather slow. I'm still several trophies away from unlocking the third main series, but I have already owned 6 Porsches. I have this odd habit of keeping the cars as closest to stock as possible, performance and appearance-wise, and I tend to avoid upgrades whenever possible, unless I really couldn't win a trophy with the car.
To me, the graphics look fantastic for a mobile device (I play it on an iPhone 4), even more so when you're using a 5th generation iPhone/iPod, as the colours look much more vivid. The physics, albeit having its own flaws, are satisfactory, overall-speaking. The cars' behaviours can be a bit unpredictable though, especially when you are accelerating out of a corner in a RWD car. The selection of cars in this game is another major attraction to me, as it offers cars which are rarely featured in other racing games, even console ones, such as the newly-added LMP1 cars. A slight drawback is the AI in this game, which seems to brake too early upon entering corners, causing you to crash into their back, but I guess this is a common problem shared by all games. Also, they do not notice your presence on the track sometimes, so they may bash into you on straights, and in the next moment you will find your car going sideways towards a barrier, which can be rather frustrating.
One thing I find surprising with the Porsches, is that the older models seemed to be more fun to drive than their newer counterparts. An example is the Porsche 911 Carrera 2.7, which sticks around corners without much braking required, while the 2009 Porsche 911 Turbo is a pain to drive, as it is really tail-happy, and its cornering performance can't quite match its acceleration and speed, thus requiring a lot of braking before entering corners.
Feel free to add me in the game if you wish to, and my name is GTEPro.
