the clutch pedal in my 04 G feels heavy, but i get better feedback. when i removed the helper spring in my 09 Z, it made a world of difference. then got a century spring(?) locally from some guy selling it. it feels a lot better than stock. not quite as good as the G's, but the gearbox feels a lot better in the Z.
SRM works best when braking moderatly to hard. if one's braking lightly, you can either clutch-out slower or give it a tap of blip to ensure smooth engagement.