Agreed, reading the T's&C's of any warranty are absolutely vital. The small print in these can reveal things you might never have envisaged.
I've just turned down a servicing plan because despite the nice looking leaflet, there were no T/C's attached to it and I couldn't be arsed anyway to sit down and start trawling though whatever they might have had.
Going back to the third year warranty. When I first joined this forum, there were people absolutely adamant (and I bet they remain so), that the 3rd year dealer warranty was crap and they wouldn't spend the £27 on transferring it across to themselves as a subsequent owner in the third year. To be honest, even with our old POP, if as the second or subsequent owner and it only had six months remaining in that 3rd year, I'd still have bought the warranty because as it turned out, buying that 3rd year warranty saved me and the missus over £1k at Fiat's parts and labour rates on the items that were replaced.
Warranties are safeguards, so good, some not so good and as always whether or not to buy one, is a personal choice/risk.
I certainly wouldn't buy it just for the sake of breakdown cover. For 3 years I bought full UK RAC joint cover with recovery etc, for £56 exchanging Tesco vouchers. I no longer need to do that because I now have a bank account which charges a tenner a month that provides breakdown cover on both our vehicles (plus I get worldwide travel insurance and mobile phone insurance included in that cover) and the bonus is, it doesn't actually cost me anything in real terms because the interest I make monthly on my current account covers the 10 quid a month anyway!
I think if you only keep the car for a couple of years, then the extended warranties might not be so great, but if you are in it for the long term, then it could work out for you. I thought I was in it for the long term with our old POP but the TA sparked our imagination. Jeez, we didn't even take the bloody thing for a test drive before we bought it, we listened to one on a youtube video and took the plunge....scary or what! At least it did come from a Fiat dealer.