I think it depends on an individual's comfort level.
For non-warranty FRS repairs I've found both the service and the costs to exceed my expectations.
I'm not all that certain if the non-warranty repairs would have all been covered under an extended warranty, or if they were needed within the extended warranty period.
I'm including my 5000a as well as the two 6700's, a 6300 I since sold and the 6600M.
That said it is nice to know that anything internal is covered for the additional period.
So I guess it comes back to how you feel about it, if it is personally easier to pay the extended warranty cost now, and if capping the repair costs for in-warranty for a longer period is personally important.
For what it is worth until I saw your post I hadn't given the extended warranty any thought, which I wanted to say as it qualifies my response now because I never considered the option at purchase.
So economically they are statistically a bad deal for the purchaser. (In the case of life insurance. You pay someone else collects). The only reason to by them is “peace of mind” in that you are paying an extra risk premium Over the actual costs you might incur without insurance so as to reduce your financial risk in future
I never buy them for electronics or cars or appliances but I am a gambler quite comfortable with risk.