The major con is a possible bootloop issue that will basically make the phone unusable. Other than that below average battery life and less than stellar speaker is the only con in my opinion with the V10. Everything else about it is great.
I think its safe to say that most of the V10s out there HAVE NOT bootlooped. Whether or not its worth getting depends on the price. Its a very nice phone.
I got a second v10 for $275 off e bay 4 weeks ago .great shape .put a 200 gb card in it .just using it at home hooked up to stereo .replaced my ipod with it .the dac rocks.rocking metallica hardwired .to self destruck .while posting this