I've never needed a jump...and as long as everything is working right..shouldn't ever need one. But I suppose if I was alone on the trail and something went bad something like that would be nice to have along. It would also be nice if it was big enough for a car for trips. I see they make bigger ones.
Another thought would on EFI systems, if the line voltage gets too low, it won't run anyway.. so jumping it would only get you a short distance. I do always take a tow strap...and a buddy on another vehicle if going very far. I trust the Moto...but only so far...lol