the only model that had a problem was the 910 as they had a 20 gig hard drive which often played up i have a 920 and several friends have 720 730 and 930 and none of us have had any problems at all i have had my 920 for 18 months now without a problem so as for extra warranty i would not pay that kind of money for it if you going to have a problem 9 times out of 10 it will happen shortly after purchase
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