How is the Interceptor 350 as a long term ownership proposition?

The Royal Enfield Interceptor 350 is often purchased by potential buyers who wonder if it will last long enough to be a good long term ownership prospect. You hear a lot about maintenance costs, spare parts availability and how well the bike ages over time. There are some owners who report having had no trouble at all, over years and high mileage, and others who have had repeated problems. The debate is also over how the Interceptor compares to Japanese competitors in terms of build quality and long term durability. Another thing to think of with resale value, as some say the bike's classic styling helps in retaining value, others worry about depreciation. In this post, I want to look at different opinions on what it's like to own an Interceptor 350 for the long haul.