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Breeding is the best way because you can get the right natures, multiple eevee's, a chance of good-perfect IVs and have a chance at a shiny eevee. so yes it is a good way.
Of course it's a smart thing to do! That way you can get all the eeveelutions, get different natures, perfect IV's or even aiming for a shiny!
Do it! NOW!
I'm planning on doing it, although no trade=no Espeon/Umbreon. That's ok, since I don't like Umbreons that much. But what's the likelihood that you get a Shiny through Eggs? (not being pessimistic, I truly would like to know)