The Volvo warranty I believe would only be good at a Volvo shop. But I could be wrong, i've never heard of someone trying to use it at a 3rd party. Warranties can be though of a bit like life insurance.... if they aren't asking for a health check, then they might not really be covering as well. What I mean is, if I were to sell someone a Volvo warranty once it's outside, I would require a service check out to look for any pre existing conditions. Then it's not a big problem. But if you can just call a company up and get your car covered, I'd be more worried.
I just saw a service customer have a bad experience with Car Shield... not that I would have expected Car Shield to be any good frankly. But anyhow, they declined all the repairs but one, which without looking at the contract, might not be surprising... the one part they said would be covered was for a motor mount and they asked our service team what the failure was, we told them it was torn and they said they didn't cover that sort of failure.... I suppose it had to snap the steal mounts to qualify. Volvo warranties I can attest are very good at covering the parts and labor. There are some 3rd party warranties that are very good. It can just be challenging for the consumer to dig through and figure out which are good and which are bad.
I remember the geico thread. It sounded too good to be true for me. When it's so cheap you can't afford to say no, you have to ask how they even fund the program. It's not like cars don't break.