The dot pitch is too big, at least at 1080P and it's just not as sharp as I prefer. I had a couple 27" 1080P panels at one point and got rid of them. 1440P@27" is good but I've just been happiest overall with my three 1080P panels, the main factor is fitting three 27" panels on most desks (& mine is rather large) is harder than 24s. Also, less neck movement to focus on a panel on the periphery. Some trial and error to reach this point but as long as I run three panels, I'll never go beyond 24".
