I know a lot of people don't seem to mind, and most probably don't even think about the person behind them. Not deliberately trying to be annoying, like in
goofy4tink's situation. Most people are kind of oblivious rather than malicious, it seems.
I have issues with a pinned ankle and bad knee, so that's probably why I feel cramped when the seat is reclined.
I waited for my kids to get to the age we could sit in an exit row - then had my knee give out!

Phooey. My boys don't fly often, so they have yet to get the extra leg room. (we mostly fly SWA, so no other option for leg room)
mhconley - I have to agree with you, I really don't see any reason why they would need to make this rule if there are identical extenders on the market. They have a rule for the locks to be FAA-approved, just make the extenders have the same rule. I'm sure that would cover any liability issues.