We are amongst the latter. This studio goes back to Photoshop 2.0 with a serial number which ended in something like 00101. For us, CIB is a foundational list of everything a creative professional must master, going beyond what appears on its pages. So, like many of the Photoshop masters, we never missed a Photoshop CIB going back Photoshop 4. (By the way, Photoshop (Ps) CS6 is Photoshop 13.)
One minor quibble with the pen is that I’d sometimes have too much flow of ink to the brush – especially if a new cartridge had just been installed. But I learned to control and compensate for this in time. Even with this occasional issue, it still earns an easy five starts in my book.