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I sold one of those stems on here a few months back. I think they're quite cool but, be warned, they're heavy. Unless you need something with a very low clamp height (which they have), I'd look at something else (probably with a removable face-plate for convenience). Also the stem I sold was for a 1 1/8" steerer, but that listing isn't clear (just in case you think it's for a 1" steerer, might be worth double checking).
Quill adapters are fine, but just heavier than any other solution.
As the title. I want to get one of these (link below) for my track bike but have to get a quill adapter. Do they negatively impact performance at all? Or are they just the same as using a regular stem
https://www.ebay.co.uk/itm/NOS-Sakae-SR-mountain-bike-stem-25-4mm-1-110mm-threadless-ahead-direct/192437476356?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649