I have minimal experience with most universal IEMs but have the UERR, UERM, and UE5 and have tried other custom options (using foam tips) from other companies and UE in the past.
If they tune the "Drop UERR" to have the same level of performance as the RM or better, it will probably still have "BA" problems in the sound, but have great technical performance - better than most $900 or less HP.
If it's just a "Drop" tuned FR and the rest of the sound is about the same otherwise, personally I wouldn't spend $900 on it (or most other IEMs for that matter).
I'd stay away from the UERR. UERM> UERR. The UERM was incredible in its day, but IEMs have come so far over the past decade that even it feels dated today.
I don't recommend it, like @Vansen said IEM is improving at a quite fast pace and UE unfortunately cannot keep up with newer models. At that budget and if you're looking at neutral sound profile I think I would just demo Symphonium Helios or ThieAudio Monarch MK2 and figure out where your preference lies with.
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