FWIW, my luthier hates 'em. Actually he hates all vibrato's. He says when he gets a Bigsby, new or used, he has to rebuild 'em from scratch because of all the slop in them. He's anal about everything, so I don't doubt him.
Personally, I've got two Fender Strats with the Fender whammy and Two Jackson/Floyd-equipped Charvels, and none of 'em stays or plays in tune for long (my Alembic basses are all hard-tails).
Just my $0.02.
Cheers,
Kevin