i bought the kit.
hissing is less but not tottally eliminated.
Its a compressor!!! will def have noise if sustain is put too high.
Im using the opto mod.
coloration definitely improved. Previously u lose all the high end with this pedal, getting all mud. Almost no cloration, sounds a tad brighter!!
my settings level at 2 - 3oclcok
tone at 2- oclock
attack at 9-oclock
sustain between 9 - 11
im using this more as a treble boost for cleans, while adding sustain.
since im using a floyd, with dark sounding pups. Sounds great when used together with chorus.