Looking investing in a 21.5" iMac and a MacBook Air to replace my MacBook Pro. However, I've become really accustomed to the glass trackpad. I went into my local store to try out the Air again, and realised just how much I prefer the glass trackpad and buttonless design. Has anyone else done a similar transition? How do you find the Air trackpad now? I wish Apple would update the Air to have a glass trackpad..