Anything which introduces variety will be good, presenting reasons to persevere long enough in the ID with native characters or winners from the main campaign. Enemies with about fifty talents all at Level 30+ are a joy which should be shared - amongst which "Unstoppable" is big fun

It's unavoidably a bit of a plod because (a) there become plenty things which can murder you the moment you give them LoS, especially melee types, which with (b) the new symmetry of LoS meant that Arcane Eye + Fireflash was increasingly the sole recipe, and (c) losing your sustains is really serious, in particular going anywhere near a Champion of Whotsit sees them blinking out quickly. Many claps to those who tackle it in proper roguelike fashion.
Stair guardians become the dominant factor, or did for me anyway - first find the stairs carefully and play chess, then can pretty much autoexplore the remainder. Is there a way to buff the rares and/or make them less rare (a little !) in return for nerfing the stair guardians a touch ? ... on reflection I'm not sure though, there were only two (a dreaming horror and an oozing horror) which seemed that they would be morelikelythannotadeaths.
In any event thanks for the addon, it's obviously built from a stack of hard work and imagination.