I have an '05 Kingpin and commute at +/-75mph on the SoCal freeways. Yes, I want a higher gear, but I don't really need one. It's more than happy to run at 80+ two up without a hiccup. 1-up it freakin' flies!
Minuses for the '05:
No 6th gear
Hard to get neutral (a quick rev helps)
Pluses for the '05
The under-rated V92 freedom engine (it's more powerful than you might think)
Heel-Toe shifter (not a big deal- until you get used to it)
Brembo brakes (later years shifted to cheaper house-branded brakes)
The stage 1 slip-ons (dropped on later years) were one of the only factory "perfomance" exhausts to perform better than stock.
Cool ROUND headlight.
In conclusion, if you get the '05 you will definitely NOT regret it.
05 Kingpin 50th anniversary edition- Totalled