M4500 HD+ screen quality

Considering purchasing this with HD+ screen (1600 x 900) and will do some sorting, tagging, etc. of photos in Lightroom and some non-critical photo editing. Will do more "serious" color critical work on external monitor.

1) Has anyone finally calibrated the HD+ screen with Spyder or other calibrator? What info can you share?

OR can anyone point to a professional test review that gives color gamut, white and black point, DeltaE and etc. from testing of screen. Not interested in a tester's subjective opinion nor in the specs that Dell provides. Just would be nice to have some more objective info on the screen quality as part of decision making process.

2) Seems like M4500 can only support dual external displays through the E dock/replicator. Have you done this? Any problems with resolution or ...?

Thanks ...

 

Dual external displays are supported via the E Port Plus replicatator. Max resolution is 2560 x 1600 per panel.