What is the opinion of Reddit about the
Wacom Cintiq Pro 16 (Old SKU)?

If you’re good with the size, then you could do well with it, the 24-inches model will likely be similar, but with a larger screen (I could be wrong with that).

Also, there’s a discount on the 16-inches model right now on Amazon:-
https://www.amazon.com/Wacom-DTH1620K0-Cintiq-Graphic-Tablet/dp/B06VSTT8J8/ref=sr_1_1?ie=UTF8&qid=1515172190&sr=8-1&keywords=cintiq+pro+16