NoMoreParagon: An 11-36 would be a new frontier for me so I have not yet even thought about trying that. I'm waiting for the supplemental cogs to arrive from Campy that'll give me a 34, for which the system is designed. My experience with Shimano
indicates that you can often squeeze in a couple more teeth on the largest cassette cog, but I'll have to defer to gfk_velo or Dave or Old Potato to see if their experience has lead to any conclusions in that regard.
I do know that Campy does not yet make a cassette with a 36, so it's automatically going to be a kludge, of course.