Some items to consider include the risk you are willing to take - and your level of ability in fixing things yourself...
On my previous rig (2000 Infinity purchased in early 2012) - I got a Good Sam Extended Warranty that I viewed as 'catastrophic coverage' - Limited what it covered and high deductible ($1000) - and I intended to use for a major powertrain issue - but I would take care of most minor things myself... Made it reasonable in price for a rig that age - and gave me the comfort that a major issue wouldn't render the rig useless while I still owed the bank $$$...
On new one (2014 bought used at end of 2014 season) - I did get the extended warranty - Cornerstone - with $150/200 deductible on all but the powertrain (powertrain still under factory warranty and transferred). They have covered little so far (though rig is in shop right now and I expect them to pay here...)
My biggest issues with them:
- For intermittent issues - if it won't fail for the dealer - they won't fix it... How many times do I need the radio/cameras to fail on the road... but work fine for the dealer... If I didn't have the warranty - I would have replaced it already - but hoping it will fail for them and they will pay for.
- Unlike the factory warranty - they won't allow you to have parts shipped to you to install/replace. Has to be written up by dealer - subjecting me to their lead times, waiting times, etc... I would prefer in many cases to just do the work myself.
Still can provide piece of mind... Factory powertrain warranty about to expire - so looking at my options going forward...
(In general - aside from the RV - I typically do not get extended warranties... as they rarely pay...)
As Doc said in his quote "Do you feel lucky?"...