My favorite hasnt been mentioned and that the "bass the world" demos but a close 2nd for me is Zach Rizer's demo's and I appreciate how thorough he gets! I don't like the kinda bass he uses, but I get a similar tone with my hands so I find his the most useful for myself.
I also dig (but not as much)Patrick Hunter's demos, but that's because he plays a jazz and that's easy for me to compare to mine (all having dual pickups and passive). Adam Aarts demos are great as well and more thorough than Patrick hunters but I play nothing like the last 2.
I don't mean to be a dick, but I can't watch the mr. Excane demos anymore after finding these other players demos(I'm subscribed to many). It's the way he plays that I can't stand, it's all disjointed noodling like a guitarist would play bass (I believe he actually is a guitarist 1st and foremost)....it's like a bassist that just slaps the whole time.
Really I don't mind talking and lower production value if the person is thorough and giving an accurate, real world represenation with *ok* sound quality....
Also I don't wanna see someone's damn bare *feet* clicking on pedals in a demo, that's just gross!! Put some shoes on for God's sake LOL