Hello,
I've managed to get a pair of Moondrop Arias, barely used, for 25€.
I'm currently listening to them and I'm a bit split on what to think of them.
They sound sort of inofensive but a bit "low-res", compared to what I was used to listening on a regular basis (Sony WF-1000XM4's). The treble isn't as detailed (even if they seem a tad brighter) and separation is quite a bit worse (on complex music, the instruments are much less distinguishable).
I must say that the bass is quite impressively deep and controlled.
I'm listening to them on a Fiio BTR5.
Anyway, I want to step to something a bit better, even if not much more expensive. At least on the same level of the wireless 1000XM4's.
I also have two Hifimans: RE-400s and RE-600s. Both are more refined than the Arias, but they lack some weight in the lower registers for me.
Its dificult to compare iems with bluetooth headphones but If helps you I really Love my 7hz Dioko. I bought them after having the arias for almost a year. The resolution and stage on the Diokos were immediately way better to my ears and taste. The Diokos made the arias sound muffled and claustrophobic in comparison. I ended up selling the arias