Is Playstation Plus Worth It?

I've been pondering over the Playstation Store recently and have gained an interest in Playstation Plus.

For £39.99 a year, you gain a subscription to play upwards of 30 games a year (changing each month) for free. Some of these are highly rated and popular, whilst others appear to be standard arcade-like games. You also gain 2gb (1gb each on the Vita and the PS3), where you can save game data.

All in all, it doesn't seem like a bad little package and its certainly tempting. Considering you pay near enough the same price just to play online on the Xbox, it seems justified.

Maybe, maybe not, room for thought.