When I've looked at Creative Live I got the impression that it was beginner/intermediate level. Whatever I looked at wasn't all that impressive to me, but then again, I'd only looked at so much of it and have been a photographer for 30+ years so it didn't seem that interesting or challenging to me. But I did look at that 2 minute video preview on Annie Leibovitz and got at least one enlightening moment out of it already (when she talked about editing for the light in a photo). Spell check doesn't seem to like any way you spell her name... Maybe master class is a misnomer; it seems to be more 'classes by masters' in their fields rather than teaching mastery of a subject. I don't know that they've all taught classes before or how good the courses would be, but I did see some on writing that looked interesting so I'm thinking about it. If nothing else you'd probably never otherwise have the opportunity to learn from them. And - it's a real business with an actual office and actual board members etc. and actually exists on planet earth. That's more than I can say about some of what's out there that wants your money/credit card info.