I was thoroughly enjoying my CCA C16 listening to Brahms clarinet quintet, while reading about praising different IEMs here.
No DDs for me, sorry - a single membrane reproducing all the frequencies at once without distortions and cross-couplings are hard to imagine just plainly or based on physics.
Listening to violins - I do prefer a bit of harshness of BAs, which is close for me to a real sound of a violin that a smoothened out recording of the violin sound, reproduced by a DD. To each their own
Waiting for C12 to arrive and hope for C18 or C20 to come