Before writing this I would say that everyone has their own driving experience. So no harsh feelings for Classic lovers. Its been 2 years now and would like to highlight some of the points which one should really think of while purchsing this vehicle.
Not so much comfortable for Rider and pillion.
Too much vibrations.
Loose control after 80Km/Hr.
Heavy maintainance.
Poor after sales service.
Engine and Gearbox is quite noisy.
Please buy after you are very satisfied, else Thunderbird can be a good option for regular rides.