I've been using a dechromed chromebook (xubuntu) as my main dev machine for two years now. I've been very pleased with it. It's light, boots in seconds, fits under my car seat, and the processor is Intel so I can compile whatever.

My main use case is "car coding" side projects; On a good day I can get an hour in before work and an hour in over lunched. I launched one mvp this way, working on a second.