I thought the same thing. I saw the sale on eBay by chance last week, only was on eBay Australia, which is where I am now. Since I would want it to be a high quality alternative to the MT-32 for soundtrack recording, not for authenticity, I was happy to pick it up- no one else bid!
I will definitely post about it once I get it, and have had a chance to play around with it.
EDIT: Robin Whittle (RWI owner) sent me this info:
I recall working on only a few D-110s. I think that all I did was
improving the sound quality, in exactly the same way as I did […]
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I recall working on only a few D-110s. I think that all I did was
improving the sound quality, in exactly the same way as I did for the
MT-32. Some of the first MT-32s I worked on had a modification which
did improve the sound quality, but had a failing in that above a certain
signal level, there would be terrible distortion. As far as I know, the
D-110 mods were after I discovered this and so did things in a different
way.
He also mentions he may work on MT-32's again someday, but his Devil Fish (Roland TB) mods are keeping him busy.