Just watched and I know he's more of a Korg OS guy, but that being said...
His one dislike that has me concerned is the screen angle. (I'm awaiting delivery of a SX-900) I don't know why Yamaha didn't angle the screen, or better yet, a tilt screen would have been nice. Does anyone agree with his "washed out" view opinion? Is it that bad you can't naturally see the bottom of the display?

Also he may or may not be correct about a T-4, or a T-5 being better, but a USED T-5 is at least $1,000 more than a NEW SX-900, so just sayin'

You Tube is great for demo videos and opinions, but at the same time can drive ya crazy when trying to decide.