I've got one fitted on a new bike and I also fitted one on my gen 1 tbh I've had em on just about every bike so I highly rate them, you can either pin the throttle and shift up or block shift, my latest mule with the full akro sounds awesome when it pops via changing with the shifter.
Anyone whom states they replicate the same without the use of the clutch by using the throttle, is by no way replicating the same a shifter kills the ignition/fueling four times faster than a blink of the eye, you try and do that, impossible.
I love the sound, shifting thro the Gears in the tunnels in Europe the sound is priceless, and when I overtake snick snick I'm gone.