I've had no issues with El Capitan at all.
Yosemite, on the other hand.... just whoa.
I don't really mind that they took away part of the Disk Utility app, as there are better (and free) programs that do maintenance like Repair Permissions etc. (Onyx is a great app).
I'm quite happy with El Capitan. Probably won't do an update until late Spring next year, if everything in the new OS is up and running by then.
Yeah, pick one or embrace both.
PTHD> 2x Pro Tools HD4 Accel | 2x Mac Pro 8 Core (16 thread) | 2x Magma Chassis | Apogee Symphony I/O, AD16X, and AVID HD I/O | 2x UAD-2 OCTO, Solo | Pro Tools HD 10, HD 12 | Studio One V3 Pro | OSX 10.8.5
NATIVE> nMP Ashtray/Trashcan Hex Core | OSX 10.10.4| Windows 8.1 Pro | Apollo QUAD "Classic" w/ TB, Apollo Twin DUO | TC Konnekt 48 | Samplitude Pro X | Studio One V3 Pro | SONAR Platinum | Pro Tools 12