I gave away my CRAs because the nozzles were too short. Think Dumbo.
I bought a pair of the ZS10 Pro 2 and found them pleasant to listen to so I bought the PR1 2 and 3 which were good but not as good as the Letshuoer S12 which I have.
I took a chance and bought the Hydro with the upgrade cable.
Removed the foam tips, put on the large Star line tips, checked the switches were 0000 and put on Saint-Saens symphony number 3 by the San Francisco orchestra and took a listen.
OMG! Popped in the S12s and listened to them. OMG again.
The Hydros were better than the S12s in every aspect.
Spent several hours listening to Jennifer Warnes, Enya, Bocelli, Toni Braxton w Babyface, Acoustic Alchemy,
David Benoit, and a slew of my other favorite cuts. Everything was better heard through the Hydros.
I use a LG V50 & V60 with a Fiio E11K, E12 and SMSL SP200.
The E12 & SP200 tightened up the bass a little bit but aside from that the Hydro sounded the same as directly from the LGs.
Since there were some incredible sales I also bought some Castor Harman, D-Fi, Polaris, ZVX, and ZSTX for family and friends. I also bought a pair of 7HZ Zero.
They are almost exactly on the Harman curve but there's several of the KZ and the Polaris that I prefer.
It's such a pleasure to have so many excellent iems to choose from and now that KZ / CCA have improved their tuning so much I hope to see many more even better IEMs in the future.
I have a pair of Thieaudio Monarchs which do sound better than the Hydros but certainly not 6 times better.
These are a massive improvement on any of the other KZ/CCA IEMs.