I've got to agree with Pismo. Obviously they make money on it on the whole or they wouldn't offer it. And you've got a pretty solid setup, nothing exotic.
On the other hand, if the peace of mind is worth it to you go ahead. Or if you're one of those people who's maybe not so good on preventative maintenance or you run the thing really hard (no offence, but be honest with yourself on this) that swings the pendulum back toward buying it.
Me, I'd probably skip it. I usually do on this sort of thing.
Don
'01 22 Classic, 502/B1
And a bunch of other stuff
"If everything seems under control, you're just not going fast enough" - Mario Andretti