Thats a hard call. Most of the time you wont even use them. But its really nice to have that comfort that if something does happen, you will have it.
The libby doesnt seem to have alot of long run problems yet. Alot of people are starting to get more and more miles on them and there doesnt seem to be alot going wrong. The libby seems to be fairly reliable over all.
We got a 06 Grand not long ago and went ahead and got the 7yr/70k bumper to bumper. The grands seem to have some problems so we thought it was the best idea. It also has MDS, im not to sure how that will do in the long run..

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LOST KJ'S
Where are you going???
Current Jeep: 2004 Jeep Liberty
-Atlantic Blue
-Air Ride Rear Suspension ; OME/Rustys Lift ; Powertrax Locker ; Moog Lower Ball-Joints ; 245/70/16 Yokohama Geolander A/T-S's on MOABS ; Flowmaster 50 SUV
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http://www.cardomain.com/id/jeepjeepster