I am owner of Royal enfield Tauras model 1995. Bike have some Pros and Cons-
Pros.-
Milage is very good( 60+ )
Bike did not have Spark plug system because of diesal engine no tension for plug.
Bike did not require Battry to start. We can be tension free about battry when it not charged.
Bike Generats Very distinct Thump when it running above 40 km per hour.
Very good for cruising at 40 to 50.
Cons.-
In winter starting become a mission in early morning.
Can cross speed 80km only with efforts, it is difficult to overtake.
Lots of vibration.
Too heavy.
Make pollution more then petrol bike.