I hated running on my Lala in 1.0 - I know I'm in the minority here but I felt like I was going to fall over and trip every time I stopped. It was really jarring.

That, and because the UI overlay had no similar weights on it, so to speak, your name would judder terribly above your head and it made me absolutely seasick to watch. (This issue is still present in 2.0-3.0 but it has been greatly reduced.)