This Teyes CC3 thing would look out of place, the shape of it has not much in common with rnsd fascia but some people don't care and that's acceptable.
My goal was to have as oem looking HU as possible, i don't want the interior to be about the head unit, i just like the modern features.
As far as speakers i didn't change mine, they sound fine to me. I'd rather invest in a DSP like HELIX but then all the recent android head units have some kind of dsp built in, I haven't tried them so can't comment.
Other people that like WOB WOB WOB BASEEEEEEEEEEEE are of a different opinion I'm sure and that's fine, and there's plenty of upgrade paths like huge standalone subs etc