I pay for PSN+ and have since the first day it was offered. I'm quite happy with it right now. They've included a ton of games for my 50 bucks a year some of which don't even expire if I cancel my subscription. On the other hand I've cancelled my Xbox Gold subscription because I was paying $60 for, well nothing actually. Once my son got tired of running around the same maps shooting his friends I had no reason to keep it. I only play single player games and download the odd demo.
Bottom line: if Sony charges and actually gives me value for my money like including a couple of games a month for free and others at a discount then I'm in. If like Xbox live I have to pay for nothing I'm out.