If you have more than just the ps4 (psvita/3) then the IGC becomes amazing value for the 5euros a month or 50 for a year that it costs. Feels like Xmas every month to see what 6 new games you get too if you have a full set of playstation brand systems, and hoping that uncle Kaz doesn't give you something you already bought yourself!
tl:dr buy psn+ for 3 months and see what you think, it's 14.99.
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