Sadly it seems that this is no an "area of controversy". On one side I see people saying that using an eGPU is prohibitively hacky and the bandwidth is too low to power games. On the other side I see people saying that it's actually a very easy set up on OS X, that drivers aren't an issue and that the way games use bandwidth, TB2 is enough to get ~85% performance from most cards. So what's the truth? And now there are a number of eGPU adapter that have actually gone to market, can someone recommend one that will actually work well with a MBA?