Sorry to sound like an advertisement here, but I'm really loving this service.
I was kind of skeptical about PS+ at first, and when I looked at the lists of free stuff and discounts that would occasionally be published during the early months of the service there really wasn't much I actually wanted. But I eventually signed up for PS+ shortly after they started including Vita games in it because I hadn't had my Vita for long at that point and it seemed like a cheap way to get some more games for it. It didn't hurt that one of the free games was Uncharted: Golden Abyss, which I wanted to play anyway and it was still going for full retail price most places. So a year of PS+ was as cheap as that one game...why not give it a shot.
But man, I never expected to get so much use out of the service. Uncharted was just the tip of the iceberg. Games I was genuinely interested in, didn't already own, and became available for free on PS+ during the time I've had it (which has only been like half a year...) include:
Uncharted: Golden Abyss
Spec Ops: The Line
Wild Arms (PSOne Classic)
This is not supposed to be a complete list of games at all, just games that I was both interested in and didn't already own. There are lots of other games that I've downloaded just because they were free but realistically probably won't ever play because I'm not that into them and my backlog is big enough as it is. And of course there are games that have been free for PS+ but I already owned (like Gravity Rush, which I bought about a week before it became available on PS+ making me feel like a sucker...). And this is just free games, I'm not even counting the discounts and things which I've also benefitted from. And I haven't even had the service for half a year yet...still have plenty of time to go. For only $50 a year it seems like an insanely good deal.
Oh, and I just read that Disgaea 3 for Vita is going to be free starting this week, so I'll be grabbing that too. Huzzah.
Anyone else using PS+? Do you love it ass much as I do?