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What sort of problems?
Shimano made stiffer rings to deal with DI2. I've used Praxis for a shitload of miles though and they mostly work fine. I a weird chainsuck incident in one of the TransAms but that was resolved with a punch and I I might've not had a Praxis outer on at that stage but a 46T from some other manufacturer.
hippy-
Chain dropping off the rings at both extremes. The FD was adjusted correctly.
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I might've not had a Praxis outer on at that stage but a 46T from some other manufacturer
Praxis are keen to point out that their rings must only be used in pairs. But then... they would say that, wouldn't they? They also say they are the only mnfctr than Shimano to drop-forge their rings. So they last well, even if opinions vary on shift quality.
Brommers
HarmanMogul
Mechanical groupset, yep? I've mostly had problems with Praxis rings and Di2.