Does this completely block off the trem as well as putting a wood block underneath? Is it instantly changable?

I want to use whammy for fun in the house but have a completely stable floyd live for gigs.
Yes and Yes. Although I dont know if it will transfer as much vibration and sustain as a wood block.

I dont like it but Ive seen it in action and it does work.

Just make sure you install it properly so it cant fall off at a gig.
Watch the demo videos to get an idea of how it works,
Originally Posted by StewieSwan
Record him while he's playing secretly and then tell him that some other guy wants to join and he sent a recording.

When your friend says, "Man, this guys sucks", tell him, "It's you, dumbass"