I just bought the i1d pro packaged with ColorChecker passport.
I have the Dell u2711 and an older Dell 20" lcd side-by-side ("1st" and "2nd" screen respectively in Lightroom). I also have a Spyder 3 Express, and have been using Argyll CMS.
Earlier, I have not been satisfied with calibrations on my 2711. I know that I probably should not expect visual matching between those two monitors, but was expecting them to be "sort of close".
Using the i1d pro with its software I still have this problem that certain saturated reds looks very different - the 2711 shows them with a purple cast, while the old 20" is more orange. The annoying thing is that the 20" looks more realistic when I bring the physical reference into the room. A 10 years old sRGB lcd should not be more perceptually accurate than a brand-new wide-gamut photo-oriented display when both are calibrated with the nicest colorimeter out there?
Then again, perhaps it is the Adobe-supplied camera profiles for my camera that are weird, and the 2711 is just showing me accurately the color that camera/lightroom is telling it to?
It is pretty dangerous to judge monitor profiling accuracy based upon Adobe profiles for camera shots!
You should get a Prophoto RGB color checker image and then compare it to a real life color checker chart under as close to D65 lighting as you can get on it.
I calibrated a standard gamut HDTV with i1 Display Pro and sadly none of my probes agreed on it hah. Although the two DTP94b had the closest take. For white balance when i1D Pro said R,G,B were balanced:
1. i1 pro said it had too much R,G and too little B
2. i1D2 said it had too much G and too little B
3. DTP94b1 said it had a lot too much R and a lot too little B
4. DTP94b2 said it had too much R and too little B
the probes all disagreed about whether R or G were correct or too much hah
all did agree that the i1D Pro said it had too little B
I used the i1pro to sample white point grayscale in spectral cal on NEC PA241W and it said (when i1DPro said it was balance) it had a good deal too much R, a trace too little G and too little B. hah. In photoshop I tried taking out 3 parts red and adding 1 green and 2 blue to dark, mid and high tones with the oclor balance chance tool and compared to color checker and it then matched less well than before hand. who knows maybe i1d pro is the best.
adding more B seemed to make a worse match, so maybe the odd many out i1d pro was actually correct on B??