Personally, I hate the idea of having the office along with me during commutes and at home (that maybe because I have been lucky to have a max. commute time of around 30 minutes one-way). If I am on call, I see the benefit in having something smaller than a full-size laptop (gives the freedom to get out of home!); but when not on call, I would much rather spend some quality time with the family or pursuing other hobbies.