Thunderbird is the one of the oldest bike series sold by Royal Enfield; it has been around for more than 15 years.
I experience with Thunderbird 350 since past 1.5 years and had never faced any problem with it. It gives a mileage of 30 kmpl and a top speed of 107 kmph. You can easily ride on it for 500 km continuously without any halt.
Its look is quite classic which captures everyone attraction towards it. Quite a comfortable seat which is suitable for any type of road. Although the fuel consumption is very low as compare to other models.
I recommend this bike to everyone.