They sound fine.
I have Bells/Prophecy and Slugs' Saloon in this format; used to have the new Spiritual Unity but gave it to a friend.
Never had the mini-LP Get Back editions, so I don't know about those.
I have nice copies of all the original ESP Aylers, so didn't feel the need for digital - however, my experiences with receiving copies has been positive. The Slugs' dates were originally on Base and, in addition to the low-fi sound, were pressed horribly. The new 2CD set is a marked improvement and has a great cover shot, to boot.