I turn a lot of Pine, mainly as Doug says for stair parts.
Though the Pine I turn is usually kiln dried it can be very hard to get a decent finish, for spindles etc a decent finish is not necessarily required as they will be reworked on fitting.
In my experience Pine is not Leylandia, that is a species best left alone it is very open grained and tears to pieces due to the speed of growth it really is crap.
I have tried to turn it and given up, for every piece I had success with I threw away another 3.
As Woody says its good experience and free or cheap practice, it ends there for me.
An old established slower grown Pine, now here you have a thing of beauty which can be close grained, sweet smelling and hard as rock.
Especially when you hit a beautiful large knot, that makes a lovely pen in its own right.
I have little experience of bowls and vases made from Pine although have done a few its better for spindle work.
Just my opinion, have fun trying it out is what I say.