The S20201 Reducer / Corrector, designed for the Sky-Watcher PRO 100 ED APO telescope, reduces the telescope's focal length by a factor of 0.85x, and provides enhanced field-edge correction.
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B&H shipped this quickly, and it arrived much faster than I anticipated. I haven't yet had a clear night to evaluate this optically, but it appears to be a solid, well-constructed item. It threaded on to my ED100 focuser tube with no problem, and the M48 T-threads attached to my DSLR T-ring easily as well. A side note: the reducer requires 55mm backspacing, and the T-threads are the wide 48mm size not the standard 42mm size, so you will likely need a specific T-ring adapter if using a DSLR. (Adding a M42/M48 adapter to a regular 42mm T-ring will probably put you over the 55mm backspacing.)
This flattener worked. Last weekend I was able to capture an amazing set of subs of M45. The corners had sharp stars and I was able to keep more of the image out to the edges. It attached easily to my Evostar 100ed and played nicely to my ASI 1600MM and EFW.