Iām actually encouraging you (@Bimodal_user) and any users from this forum and in general, who are remotely interested in getting a pair of Sphereās to get the proper molds before testing. The reason is because while the Spheres are focused on denoising capabilities, itās very difficult to test that without getting proper sound clarity. I didnāt realize how much of the sound clarity was contributed by the titanium cshell molds, which is why I put my trial on āpauseā.
The audiologists did leave me to enjoy the trial pair of Spheres until I get my new orders of titanium cshells (8-pin) that will be coming in this week. In the meantime, they have set up the Sphere HAs for REM, but it wasnāt enough. Iāve decided to leave them in the case for now, and wear my lumity as they sound clearer than the Spheres only because of the difference in molds.
Regarding your question @Bimodal_user, I could see on my titanium cshell there is an acoustic code imprinted on my titanium cshell, so thereās my answer 
I transitioned straight to titanium for 3x main reasons:
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less itch = more wear time
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WAY more comfortable = more wear time
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more robust and durable = lasts longer
The other benefit Iām assuming is because the titanium shell is thinner than acrylic which gives the technician more freedom to fit components more freely and come up with a more custom fit for my case (deeper).
It might help to know that it took 4x-6x iterations of my titanium cshells before i got my perfect fit, and it was well worth it!