I have no idea how different reps/helpdesk people/technicians of ViewSonic can all disagree about this, very sloppy if you ask me.
I've had someone tell me it works, but after asking the same person again just to make sure (said person went to a technician apparently) she stated it wóuldn't work. Then another said it would work on a mac but not on PC, however when I linked to the manual he corrected himself that it wouldn't work. The third directly said it wouldn't work.
Really glad that you tried it out, really appreciate that.
Still am thrown between the U2713HM and this VP2770. According to PRAD.de the U2713HM outputs up to 430cd/m2, versus 310 for the VP2770. Quite a large difference and since they both have non-pwm dimming that's not going to make the decision for me. However I find it very odd that Dell themselves state the screen has only 350cd/m2 max, while PRAD.de states here that it indeed goes up to 430 at 100%.