I used my laptop exclusively for years until I bought my desktop recently. I had a 17" screen. I don't think I'd want to go any smaller than that. It was fine for me all those years because that's what I was used to looking at, but now that I have two big desktop monitors I'm sure it would seem tiny in comparison. As a backup method for you though, I think it would work just fine.
I use Windows for both though, so I can't help you on that front. I did consider going to a Mac with my last laptop purchase but decided that I didn't want to deal with that learning curve or the extra expense. Personally, I'd save myself the frustration and cost... as a backup method only, you may as well stay with what you know.
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