I recently purchased the PA 231,and the SVII software.
Using the colormunki to calibrate ,I'm getting excellent results.
Last week I wrote NEC to find out if the new i1pro would give me more accurate results,and here is the answer I got from Eric Ganshaw{NEC Sales}
" Mike,
It may be slightly better. I don’t know if you would be able to tell the difference. I would recommend sticking with what you have. Unless you really want to go out and spend the extra money."
Here is Erics contact info,if you need it.
eganshaw@necdisplay.comPhone:630-467-3427
These people are a pleasure to deal with....
From what I've read,your pa271W is in another league to my pa231w,so,your results.... may vary??
As of now,and until I find that the i1pro will definitively give me better results,I'm staying with the colormunki,for my calibrations
Hope this info helps...