I use NLC’s dispersion delay and delay no more 3 (both pt2399 based) and mungo d0. I mention d0 because, depending on what you put in the feedback loop, say a lovely gritty filter such as Belgrad, it can be as dirty as you like.
Both NLCs are triple channel so they are good for stereo effects, feedback stacking and so on. They’re large and currently I rack only one at a time. I finished an album recently that was a kind of textural indulgence in the pt2399 chip, by way of how it’s used in these NLCs. As much as anyone else I love how it sounds when the chip is right on the edge of breaking, and the feedback goes all snap, crackle and pop.