Wow, I'm totally amazed by the sheer number of (962 as of this morning) Tyros 4 demo videos now up on YouTube.
This is the first time I've ever seen so many videos being posted on a daily basis, of 'one specific' arranger keyboard model, of which includes live recordings by amateurs and pros alike.

Here are just the latest posted in just the last 24 hours alone.
If these and the hundreds of YouTube videos already posted don't convince you that Tyros 4's a fantastic sounding keyboard well worth purchasing, I doubt (short of playing one yourself) anything else will: