Will this or is there a version thereof, that will work with mac OS Sierra 10.12+?

This will work with that OS. The software also has a recent update.

I have a spyder 4pro. Was that not accurate? What's the advantage of upgrading?

My Spyder4 Elite runs perfectly fine on Windows 10 running Datacolor's latest software. The advantage with X appears to be in speed of calibration. It takes Spyder4 Elite around 10 minutes to calibrate one monitor while SpyderX says mere minutes to complete.

Will it sit flush enough to calibrate a curved monitor?

I doubt it. I have a flat one, I have to lean it back and tape it to the monitor because it just doesn't hang straight down or have enough weight to sit nicely against the screen. In my opinion they leave it to you to do a lot of work just placing it.

ASIN	B00UBSL31Q
Batteries	2 CR123A batteries required.
Best Sellers Rank	#111,603 in Electronics ( See Top 100 in Electronics ) #410 in Motion Detectors (Electronics)
Customer Reviews	4.4 4.4 out of 5 stars (1,576)
Date First Available	March 24, 2015
Is Discontinued By Manufacturer	No
Item Weight	4.7 ounces
Item model number	S5P100
Manufacturer	Datacolor
Product Dimensions	2.73 x 2.93 x 1.71 inches

Spyder5PRO – Designed for Serious Photographers and Designers (S5P100)

Description

Specifications

Common Questions