Just a brief update on this one after a few weeks use with the Whisper.

I can say with much more certainty now that the Whisper seems much quieter than the SAK. I still don't have access to any proper decibel measuring kit but tried the test Baz suggested and the difference over the SAK was much more significant.

Even better is that, as someone else mentioned, my groups have tightened up considerably and are more consistent over those shot with the SAK fitted.

Overall I'm very happy and would definitely recommend spending the extra dosh on one of these little mods. Top kit indeed!

ATB
Paul