Hello Andrea,
We appear to have had the same confusion, to maybe I can clearify your statements a bit more:
Regarding points 1) & 2):
These are correct, please see my post in which the differences in SpectraView packages/model lines for the US and EU markets are described.
Regarding point 3) & 4)
At first I was told the same thing.. Which only raised more questions on my side. But after further questioning NEC support it turns out that these statements are based on using SpectraView Profiler 4 software. Which makes sense of course, simply because NEC EU only supports that software. It's a marketing thing, they want to sell more SpectraView Refencence models and software.
It's very important to understand that the software in the US (SpectraView2) and EU (SpectraView Profiler 4) is different.
-The EU SpectraView Profiler 4 software is only available in combination with the Reference models and only allows hardware calibration on those Reference models (I assume by checking if a SpectraView Profiler software checks if a Reference model is connected)
-The US SpectaView2 software allows hardware calibration on ALL!! EU/US Multisync/Reference models, nothing in the firmware of either model is enabled/disabled to have more/less functions I was told.
-3rd Party software (like the stock X-Rite software) can not(!) do hardware calibration on either the Multisync or the SpectraView Reference software, because it cannot talk to the PA241W hardware to save the adjusted settings.
If you want to benefit from hardware calibration in the EU you have 2 choices:
1) The "official" way is you get the SpectraView Reference241. Pay ~1300euro and you get the a highly selected display, hood, extra warranty and the apprpriate SpectraView Profiler 4 software to hardware calibrate your display.
2) The "creative" way. Pay ~1000euro to get a Multisync241. The pay ~320euro (incl shipping) to get the US SpectraView kit
through an eg America webshop or an American relative..(or just the SpectraView2 software for ~120euro)
In both cases you pay ~1300euros to be able to hardware calibrate your display.
I've allready ordered a Multisync for about 1000euro. The Reference wasn't available yet and I expected the SpectraView Reference241 to be more expensive. Had I known the 'difference' would be ~300euro. I probably would have waited... Because now I still need the proper software, and in the end I pay more or less the same, but then I would have had the higher quality Reference model...
Another important issue is the use of your X-Rite i1 Display2, which is not fully suitable for wide gamut. I have the same sensor (the stock one, not the NEC custom) and asked NEC US support if this would give my any issues calibrating the PA241W in combination with the SpectraView2 software. Their first response is that the stock X-Rite is not advised because of the wide gamut of the NEC displays. You could get slightly incorrect wite point results. Using the sRGB calibration you should be fine I was told.
As various sources on the web confirm with for instance the 2690, the white point can be off by about 500K, so if you know this, you can work around it by eg choosing a different target. But to be completely sure, and safe yourself the hassle, it's better to get the NEC custom puck (again, officially only for the US.... ) or the Spyder3, which also has wide gamut support. (note that some very early produced Spyder3 models had issues with wide gamut, but current models are compatible)
regards,
Peter
edit: added more specific remark about the i1 Display2 not being optimized for wide gamut.