I just got delivery of a Q5 Pro from lightnspace (didn't look at the 27Q comments to see others had a negative impression of lightnspace aka astrobile).
No dead pixels and beats the colors on my old Hanns G 1920x1200 27" monitor. In portrait, it looks to be a fine coder's monitor for old eyes set up next to the Hanns G in landscape (the stand works well for a cheapie).
lightnspace seems a little spotty ; they show a FEDEX image in their Ebay icon for the posting but ship via international post; mine arrived on the 7th day; and their confirmation email mistakenly said it was shipped regular 10 to 20 day which got me nervous, but an inquiry got a reply that it had been shipped 'expedited'. The astrobile listing, at least, mentions that it is not FEDEX.
So far I'm happy with the monitor I got, though that Fedex icon really ought not to be there, and I can't imagine I could ever try to stake a claim under their authorized vendor warranty (or from any of the ebay vendors who don't have a USA based service organization). The little control buttons are cheesy and look like they could easily break. The casing, I really like ... reminds me of good custom sheet metal construction from the early days, these are not mass produced monitors.
On kill-a-watt, I see 67 watts at lowest brightness setting (about 15 more watts to get something that doesn't look dingy), and 144 on highest, with 2 watts on sleep mode and 1 watt switched off. I'm curious if there are more efficient bricks available; a bit of an obcession for me.