The "everyone" you spoke to are incorrect in my humble opinion. I have P Zeros on the Ghibli and it's undriveable safely below 5deg. P Zeros on my 3200, one blew up on the M6 and nearly killed me. P Zeros on my wife's XC60, lethal below 5 deg once worn past halfway and now changed. I have seriously considered changing the Ghibli tyres to CS3 as bigbob is correct in stating, these are now approved "MGT" tyres. I'd change them if money was not a consideration.
Just a quick search of the web will find many poor reviews of them.
That being said, if you driving in warming climates, like our Aussie friends, they are totally fine. It's cold temperatures and standing water that gives the issues.
For me, I will never choose them unless I had no other option.
Personally, I like Vredestein products, Michelin Pilots and Continental. On the XC60 we went for General Grabber GT which I had on the XC90 before and the Touareg r50 before that. Top tyres for heavier, 4WD vehicles. My wife could not believe the difference on the XC60, she was scared to use it on the P Zeros, now she thinks it's transformed.
So there you have it. P Zeros are fine in the warm and dry and scary and dangerous in the wet and cold.
Not used Goodyears so can't comment on them however I suspect they are good too.