A friend recommended these strings to me a while ago. Although they're a little pricier than your standard set of strings, the coating means that they genuinely last 3/4 times as long! And they sound brand new for ages!
I've had my set on my acoustic (which I play for about 2 hours a week) for a year now, and they still sound as good as the day I put them on!
The extra that you'll pay for these strings is definitely worth the money. Not nearly as costly as 3 sets of standard strings, but sounds better for longer!