I have myselves not used one for two years, though I have recently bought a Cokin P type holder and two filters and am now looking to buy this CPL.
Here are my example photos taken almost exactly 2 years ago. Click the photos to view the descriptions (all links open in a new window/tab)
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My photostream on
FlickR
Canon 450D w/ grip, EF 85 1.8, EF 24-70 2.8L, Tamron 17-50 2.8, EF 100 2.8 macro, EF 70-200 4L, multiple flashes and light modifiers