Thanks, ok. I just checked that one on ebay and for some reason it is more expensive than Philips' 43" IPS 4K screen that has a lower response time. I'm not sure why. Maybe your one is higher quality in other ways and so doesn't suffer from image retention?
https://www.ebay.co.uk/itm/381858621490
This demos image retention, in case you arn't sure what I mean:
It is a nice quality monitor with an awesome base, but refresh and retention are not things I looked into.
This photo is before we upgraded everything after selling all our Bitcoins in December - all the old stuff: