I went on a big Delay adventure the last 2 years or so, lol. I bought several, and built several.
I have the SDE-3000D, and I like it a lot. However, I don't really use it's potential either. I wanted it for a Dual delay, but many times I find dual delays to turn into a wall of mush with a lot of gain, so I don't end up using it. I also wanted to use it as a Chorus pedal, but I struggle getting good Chorus tones out of it. It gets too shallow or phasey, or something.
I also have a 2290p that I like better in terms of a giant mega-delay.. It has amazing Chorus tones, and I find the delay to be clear, but do it in a way it stays behind the main tone with a lot of gain.
I was going to buy the DM-101, but I ended up building 3 or 4 analog delays. They sound good, but too dark for my usual use. They turn into a wall of mush also with gain. I find the EM-5 clone doesn't do that. I also built some FV-1 based delays which can sound good. The Dispatch Master is based on that chip.
I think I use my lowly Flashback II the most. That 2290 setting just sits well with gain, the modulation tones are good, and it is analog dry through. It just works most of the time. I can use my rack units also, but the TC pedals are usually just easier.