They sound good (those that I've heard) — essentially identical to the SHM-CDs on the market. The "ultra high quality" and "super high material" markers are of course gimmicks. Perhaps they make a smidge of a difference*, but really it's the transfer and remastering that count. If you have the "regular" CD of certain material, you're probably set. In some cases, the recent Japanese issue is noticeably better (sonically), but that's always on a case-by-case basis. I don't have a lot of the live Mingus sextet material (even though I'm familiar with it) in hardcopy, and so I'll probably pick up some of these centennial releases.
*Notable exceptions, to my ears, are the Blue Note SHM-CDS from 2013/14, and the Impulse! UHQCDs from 2020. They sound really good.