Hi Darylrese, fellow Hampshire guy! (I'm from Fareham).
Been keeping an eye on this, I got this monitor similar time to you, went from an Asus PG279Q to this Acer.
Mine is fine so far, not perfect but not bad either, certainly BLB not as bad as some examples even in the last few pages.
I don't have a great camera to capture this with, using my S4 phone camera. My full white screen:
Full black screen, actually I see in person on a fully black screen some in the bottom right and top right corners:
I can't really complain the colours look very nice to me, I haven't tested any of the ICC profiles or anything yet though.
Compared with my Asus PG279Q White screen:
BLB from the Asus:
Needless to say the Acer is much better to my eyes so far, much less BLB even if still a little present. The Asus had noticeable colour shift near the top, the Acer may have it also but it's much harder for me to spot, I was already packaging up the Asus to send back after a few days, I've had the Acer now since last Thursday and still using it happily.
My Acer settings are as follows:
Colour temp: User