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I have no useful experience to add but would be interested in hearing about your current set up and why you want to change? You have a Niche Duo don't you, isn't upgrading the burrs to SSP not worth pursuing (apart from the warranty issues) or the swapping from filter to espresso on the Duo is too much faff and you want to go to a dedicated 83mm espresso grinder?
Edit, ah I see you are talking about changing burrs, not the whole grinder.... Ignore me!
83mm flat burrs for espresso- so many different opinions out there as to what’s best.
So- give me more opinions please!