I prefer my 12" PowerBook G4 for many uses to my 2013 15" MBP: the G4's keyboard is IMHO better (I do not think the chicklet keyboards to be particularly good); the size of the G4 suits me best probably 80% of the time; the PowerBook is by now effectively expendable (losable, breakable), which actually makes me want to bring it places and put it to use — as haemogoblin says, precisely because it is not worth a ton of money, I feel more comfortable carrying it around; and it runs a wider range of my existing stack of software than the MBP. There is little that it will not do.

Now, obviously the MBP is way better for some things, like, say, batch converting AVI to MP4, which I would not think of trying on the PowerBook. Otherwise? — meh. And since batch conversion doesn't happen very often around here, i probably should never have bought the thing.

Tools that perform well for their intended uses are pleasant to use, I use things that are pleasant to use, the PowerBook performs really well for me in many daily tasks, and so the PowerBook tends to get the more regular use.

Go get yourself an Al G4.