I have used several, I also rock DreamColour displays at work along with a firey on a production (versant) printer so colour and it's correctness is important to me if im in photoshop, or at least correctness against a print or a design filing.
I haven't used anything so fancy, but, I have calibrated a few monitors in my time and I got my Pioneer Lx5090 professionally calibrated when I bought it years ago. I could always get the colours to look the same between my Nvidia and AMD setups.