I know this entire topic is obsolete now that a reflash is available, but I went for the Z-Bomb because I had an E-Bay gift certificate for $50 and blew my motorcycle budget wad on track days.
I have to say, people pay lots of money for the type of improvement the Z-Bomb gives. The hesitation in 1 and 2 is gone, and the power is now much more accessible. At slow, easy pace riding, this won't make a bit of difference. BUT - for those that like to accelerate up the gears and give a bit of go juice to jump ahead, this is a SERIOUS upgrade. I knew what to expect from reading above, but I was still ridiculously impressed with the improvements to power delivery in 1st and 2nd gear. What was Honda thinking???
Now I really want the Guel (SP?) reflash, as it supposedly has more aggressive timing available, in addition to a bunch of other convenience items (gear indicator works, speed limits removed, fan temp adjustable, exhaust servo-alert can be killed if you want to remove the servo motor completely, etc.).
People pay a lot more than $50 to get the types of improvements made available by the Z-Bomb... I can see that the easy access to power could be a little dangerous to an inexperienced rider, but really, what was Honda thinking?!?!?
Great mod - I now understand why it was such a big deal when it came out. (I drive a 2010 F with the only performance mod being an open flapper in the exhaust).
- Dan