I find that I tend to grip it more from the bottom corners than the side, and if you hold it with both hands like you're holding a book open then there's no issue. Being right-handed I tend to hold it with my left had in the lower left corner most of the time.
I was going to say that it felt weighted a bit more towards the left hand, but I just balanced it on a straight edge and the weight distribution is almost perfectly even left to right as the unit balances at a point just between the two halves of the keyboard.
The extra thickness on the left is nicer for holding it than the thinner right side, but it's not as big of an issue as you might expect and I wouldn't worry about it. I suspect it they could have they would have made both sides as thin as the right-hand side.