ASR Emitter Upgrade

I have a 2008 ASR Emitter Exclusive Blue. I see that there is now an upgrade kit for 360 dollars that can be obtained. Would like to know from other ASR Emitter owners if it is a worthwhile upgrade and how difficult is it to do, mainly how many resistors have to be removed and replaced. And also the most important part is how does is effect the sound. Thanks for your responses.
Hi Fatman
Yes it is great upgrade,nothing in the same price range would give the this kind of improvement.More bass control,better prat and maybe not so "gray" sound.
I dont know much about the installation of the kit but
it takes a few hours from somebody who is familiar with the amp.
I meant to write,Maybe the sound was not so "dark" not "gray"