Cambridge Audio 640p vs. ??? - outcome?

I'd like some 1st-person comparisons between Cambridge Audio's 640p phono pre-amp and other phono pre-amps, including on-board phono w/ any integrateds. All impressions welcome. Analysis of either MM or MC setup would be helpful. Thanks for your time.
Have a look at there's a lot of info on the 640p over there.
Thanks - I digested the PFM posts and was looking for some additional comparisons. I did get some good comparisons there since I have some history w/ Naim phono gear.