A good mod IMHO, was not so sure of difference after having it on for a while, so took my long weekend as a chance to test it properly.
Removed it for journey outbound, cue 150 miles of annoying surging and constant popping and banging (although I do class the noises as character)
Refitted after arrival at holiday cottage and it was a revelation, much smoother and I am sure a bit more low-mid range power (may just be helping get most from cat-less headers) plus the Women hates all the "silly noises" which she finds embarrasing as she reckons it sounds f**** - Pointing out she can always put the black visor on does not get approval.
Outbound I managed 42mpg, coming home 43mpg and I tried my best to ride the "same way". This was two-up with full luggage so not too dissapointing.
One thing I have noticed is fuel consumption plummets past 80mph and the cases have a large effect as well.
On a ride out on Sunday (module fitted) whilst being held up by my mates ZZR1400 I managed to average around 53 mpg (two-up, no cases and limited top speeds so his Mrs could catch up on the straights) although I cannot ever see me riding slow enough to regularly attain this, it is nice to know if your low on fuel slowing down will help (My ZZR did 40mpg at 100mph fully loaded and two up, yet barely managed 45mpg at 80mph solo - no point slowing down really)
Overall I prefer the feel of the bike with the module, fuel consumption is about the same and I am sure it is also far less likely to drop a valve, not bad for £30 (worth the extra £29.98 over a resistor bodge just so I can fit it in seconds without hacking up the bikes wiring)
Good write-up
I removed my Module prior to taking my GSA in for its 18k service recently.
On the ride to/from the dealer, my bike felt horrible. The engine felt rough as arsholes, and quite gutless.

I refitted the module as soon as i got home. Now all is good with the world again.
