I have been eyeing that very monitor and also considering getting 2- 2560x1080 Ultra-wide monitors Stacked
The one thing that I noticed in the reviews for the 4k Monitor is the 30hz rate gives noticeable lag on the mouse.
The reviewer said while it’s noticeable, you can get used to it…sigh… I think I’ll wait til at least 60hz to jump onto my 4k or just go w/an Ultra-wide stacked setup 