Perhaps i can help shed some light on etaw2011 video since i can understand mandarin (Chinese)
Personally i had not yet purchased any watches from him.
In terms of QC, he far supersedes the rest of the trusted dealer, he provides step by step QC check to the buyer.
Let me elaborate:
1) gee~ realised i dun even know what to call that, Say"time machine" checking
2) operational procedure, teaching buyer how to operate the watch. Useful tips for watches like IWC top gun, ie. dun change date/day when either /both hands is on the right half of the dial, else it will break the movement, operation for chrono top button start stop, bottom button reset, etc
3) Cleaning the watch - to inspect dial and dust under the crystal
4) INspect the hands if they are straight at 6 o clock position, check on date change, date centered, etc
5) INspect for scratches around the case.
6) if it's chrono, testing of chrono running for long periods.
7) Usually has two video, one for QC and one for packing.
I contacted him for some quotes but his price seems to be on the high side compared to even Andrew/ Josh. Not so sure, if he includes tags and rep box set, as he tends to get a little "[censored]" when i ask more questions. May be he is busy and i have not yet bought from him.