If you are undecided as to whether you should buy or not, I would say if you do not have a TWSBI already then you definitely should. Or if you are looking for a nice size to carry around and you find what you have already have a bit bulky to lug around then yes. If you are not so keen on mini sizes, prefer writing for longer periods or want a larger ink capacity then it may not be the one for you.
I went for the classic as I thought that this combined nice classic looks but still had the usefulness of being able to see how much ink was in it. I think that the classic looks classier than the other clear demonstrators or other colours that they do, but I didn't want solid colour as I couldn't see how much ink would be in it.
In summary I am very happy with the pen and it is great to have a TWSBI back again.