It is not necessary but some people like to pay extra knowing it can go back anytime in the 3 years with as little fuss as possible. Someone should also be able to do it even a 1 year warranty as the PJ hasn't lasted a reasonable amount of time. However, the manufacturers may make the process more complicated/stressful. I had no problems with two HD700's but have seen two PJ's being sent back recently. A HD800 had to be sent back after 7 months and had done 300 hours with no problems. It is now back fixed. Even my HD200 has problems (see the other thread about horizontal lines with negative keystone) but they are managable and still affects the HD20. There is a big difference over the HD65/HD700 and the HD20/HD200.