PROS: Here in the North East I have encountered eastern white pine very commonly used as a subfloor in many of our 80 year and older houses. If it sound and hasn't suffered too much damage from other floors being nailed to it, by all means try to restore it. The thicker 1" planks have more life to them. When 4 coats of oil based urethane is applied this wood turns a amber red color which turns redder over time. And certainly if you can find some antique pine try this as a new installation.

CONS: The newer plantation pine is as soft as balsa wood I would never recommend this species of pine for flooring, only the old growth material is somewhat useful.