Not my favorite. Everything is harder to hit.
With Lion, Apple has changed OS X interface and how we interact with the computer.
It's easier to invoke mission control or launch "pad" with a mouse. Apple moving away from a system that works well with a mouse. It now works better with your fingers.
Most days my hands fly across the keyboard and move the cursor with a mouse, or a drawing tablet pen. Not with a track pad. I have never wanted to control Nuke, or Shake for that matter with a track pad. It's terrible. Ask any digital artist if they use a track pad, they don't.
As a Nuke artist I'm still not getting used to the new operating system, Lion.