Took the plunge and ordered the PG279Q. Seems like a gamble but I'm intrigued to see the differences between that and the Dell. Strangely the backlight bleed I had on this monitor appears to be greatly reduced now, and with the colour profile from TFT Central this monitor really does look great. Running 12 / 65 for Brightness and Contrast and 97 / 97 / 94 RGB.
Now that more and more people are buying this monitor (and posting their experiences both here and on other forums) it does seem that the QC for this model is superior to anything Asus / Acer are currently offering. Relatively few seem to be going back, and the people who do return them seem to get a good second one.
I'll have a day or two to compare the S2716DG and PG279Q before having to make my choice as to which one I keep. I'll pop up my thoughts in case anyone is trying to decide between the two.
I'm really tempted by the Dell currently, so I'd love to hear your thoughts on the two.
Cheers!