I can only speak for the Digilog but it has been the single delay on my board for > six months. Generally, it is pretty warm for a digital delay but retains all the clarity you would expect.
The "feedback switch" is wild. Even if I could find another delay that sounded a little better I doubt I would give up that switch. My primary observation is that when I place it after dirt the feedback gets very loud very fast. When placed before dirt it creates a big wash of feedbacky repeats that stay at a constant and manageable volume. BUT the feedback stays even when you lift your foot off the switch. Nice for creating the cliched wall of feedback sound at the end of a gig. At least that's how it works with my rig, YMMV.