I've been commuting for years on a mtb, and I bought a used road bike this summer.
I most certainly don't regret buying my road bike, but I am very happy I still have my commuter bike, and at the moment, my dhs old bike to use for hopping around in the woods. There's a reason "everybody" here uses mtb for everyday use, they are more practical and robust.
And I'm happy I haven't dropped lots of money on buying a road bike. I think if I'd spent loads on a really, really nice bike I'd be feeling I should be using it more than just for whizzing around for fun a couple of days a week.
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett