My A-Bomb bridge is in. My overall impression is that it is considerably different from the Rebel Yell. The Rebel Yell is smoother and more open sounding with a really aggressive and chirpy pick attack. It really has 'that' vintage rock Les Paul sound going on while simultaneously being higher output. It's a fantastic pickup but definitely equally good to the Nailbomb which just does something different.
High gain / Metal tones are absolutely SICK with the A-Bomb bridge and even the Electra Dyne snarls up nicely now with a nice high end edge to the tone. My pickup height is sensible again and I get a nice tonal balance with the neck pickup. Maybe I've been playing too much high gain stuff lately but the lead feel was kind of like chewing on styrofoam. This could be just because my fingers are confused....
Of course, I now have a new guitar that, for the first time ever, is a 25.5 scale instead of my other that are 24.3/4 scale. To say it is an adjustment is an understatement. I'm planning on getting the new axe all tricked out but during this time, I need to just use the A-Bomb for awhile and determine if I really take to it more than the Rebel Yell. It's not better or worse, just different.
I have a track I played with the Rebel Yell using vintage hi on the Electra Dyne. When I have a moment I'll try re-track that part with the A-Bomb.
So, the verdict so far is that the A-Bomb is better for crunchy and crushing rhythm tones while the Rebel Yell is more fun for lead playing. I'll spend some time and see how things go.