The main reason this wouldn't work for me now is probably presentations. While I do like my laptop very much and play with it all the time, the impetus for getting one in the first place was to be able to give presentations on my own computer rather than worrying about if they'd work on someone else's.

I don't really use all the features that allows--for instance, I rarely switch over and run the lab's software in mid-presentation to demo something--but it's nice to have the option.