There's no right or wrong answer to that one. It depends how much you want a GT and what else you would get instead, if you didn't get one. To me there is no competition for the SC range in the market place, unless you don't mind something heavy and slow.
Although you'll read about tank expansion on here, (where people share problems) I'm not sure you can guarantee that it WILL happen to you, and for some people it's a big deal of bubbling paint and replacement tanks, while for others it's a small deal where you need to space your tank mounts out with spacers.
At the end of the day these are unique bikes, now discontinued, and you need to be a little more dedicated and ingenious to own and run one.
(Asking people on here if they think owning a GT/SC is worth the hassle, is like asking Al Quaeda what they think of Barak Obama and expecting an objective reply)