For me, these IEMs can take me through a long time for my daily dose of hi-fi audio. Heck, I might even buy a new pair if these get worn out over time! No hyping, just pure satisfaction. I've heard the Andromeda countless times, used to own the Nova but sold them for sound sig preference, I still ended up with the IT03 as my only pair. I might get something from the higher priced ones like the Andromeda or A91 but it will take time and the IT03 keeps my desire to upgrade almost close to zero. 2-3 hours of listening session is enough for me, 2-3 sessions in a day is already plenty. I'm just saying I'm good for now, and only trying out some other mid-fi DAPs to discover the best synergy.
I tried Spinfits for these but the bore is quite narrow, lessened the soundstage a bit if my hearing is correct. Also tried Sony hybrid tips. Better fit for me compared to the Spinfits but still has a narrow bore. Don't get me wrong. I've enjoyed using Spinfits with some other IEMs. But for these, I ended up with the stock tips, medium, wide bore, nozzle pushed all the way inside till the mesh is showing almost flushed with the opening of the tips. Better clarity, soundstage, and appreciated the dynamic bass much better. YMMV of course. What I can tell to you all is that these IEMs are quite tricky just as
@Paul - iBasso always say. Not because your first try was bad, it will always be bad. No. Some experimenting and tweaking of the fit will reward you something good for sure, not unless you prefer a totally different sound sig.