I was loaned one as a courtesy bike when I had a Tiger (a few years ago now) and I absolutley loved the thing; the sound of its exhaust, the torquey engine, the handling and the sheer beauty of it. Triumph build beautifully screwed together and well balanced machines, it has to be said. It is an excellent bike.
Not for me, though; it's a totally impractical machine for my needs; I don't do day rides and I doubt you could tour on it comfortably. Suffering as I do from neck, and by extension shoulder and back issues, it would end up being a plinth bike. I have a RE 650 Interceptor for riding into town and it's barely done 1600kms in three years. Obviously, the RE is a piece of junk in comparison and so doesn't have the same draw to go out on it, but I doubt I'd have put very many more miles on a Thruxton by now. I just don't get the time.
I guess it comes down to what your needs are and what you will use it for. I would never have it as an "only bike", personally, but if my needs were more aligned with its virtues, It would be top of my list, for sure. Such a beautiful bike.