I'm against every type of extended warranty. Instead, never purchase the warranties and the odd time something goes wrong past the standard warranty period, pay to fix or replace yourself. I've heard this referred to as self-insuring and, in the long run, you spend less UNLESS:
1) the warranty covers accidental breakage such as dropping or drowning the thing,
2) you know yourself (or the intended user if buying for someone else) well enough that such breakage is likely,
3) you have strong faith that the warranty will be honored with no extra expense to you, and
4) you are willing to jump through whatever hoops there are to utilize said warranty.
All four conditions are never met in my case, but these guidelines are the test I suggest for any warranty purchase. Basically, warranties don't make sense for most people, which is why companies make tons of money selling them. Or take the easy route - skip the test - and "Just say no."