Yep, I've used them. Acor brand which I got off fleabay. Nice quality four part shims in black ano finish ~ assemble with a lick of grease or anti-seize and they work fine and quietly.
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no real problem with then but I personally do not like shims of any sort: for bars or seatposts.
these parts are pretty cheap so buy the correct size one - there are plenty of 1" bar stems around - treat yourself!!
now trying to find a 1" bar stem for 1" steerer is the real challenge.