I will look at some of my subs:
- PechPong TT (great skills overview/breakdown videos, his match videos with commentary in the past were insightful as well)
- Table Tennis teaching Channel (also very good instruction from Chinese coaches, but haven't been watching this one much since we had GTTS)
- WRM-TV (lot of stuff, haven't watched in a while but plenty of good videos on various topics)
- Olav Koslosky (nice topics and presentation)
Good vlog style - improvement/person's journey
- Vlad Road to WTT
- LMTLS
And ya, of course TTD is one of the all-time great channels!!!!!