I've been riding campy for a few years and much prefer it to shimano I tried DA 9000 last year and didn't like it so went back to campy. But I wanted to try a 11-32 cassete as I live in a really hilly area with a bunch of fun climbs with large sections over 12% grade. So I threw a 11-32 on my powertap wheel (I already had a spare shimano freehub left from the da9000 days) and threw it on the bike. I had ordered a long cage athena derailuere (triple) and was planning on using that too. To my surprise it shifted great perfect actually just as good as my previous 12-29 super record cassette. I didn't even need to change the derailuer. I will say the setup I have with 50/34-11-32 is maxed out and if you had 52/36 or 53/39 I'm sure you would need the triple rear derailuer. Just wanted to confirm that shimano 11 cassettes are perfectly compatible.
Here's a pic of my bike with the 11-32 Edit: if it's for sale, please post in the appropriate forum.