|Vibram FiveFinger Treksport|
The main difference, which I plan to test out on my next trail run, is that the Treksport is built with a bit more protection on the parts of the foot that are more prone to injury and pain from the rocks of the trails.
Besides for that, the Treksport shoes are a bit more comfortable than the Bikila. The design of the shoe seems to be a better, more comfortable fit. Granted, so far I have only worn them for a few minutes, but this is my initial impression. The velcro strip is different, and better. The material seems a bit softer. The fit is a bit better.
Wait for my review after running in them on the trails. These are only my initial impressions. I am impressed.