I have the same ECs clutch kit with 14lbs. I would have to say, idle noise is definitely noticeable. Once you get off the line, drives same as stock. Clutch actually feels slightly lighter with this kit. There is no noise on drive, but overall I think there is slightly more transmission noise. At idle, if you use airconditioning a lot, you will hear it at higher tone... like a reasonably quiet small tractor. But with aircond off, not bad.
If you like a 'refined' ride, stick with stock DMF.
If you like the 'grab and go', slightly more responsive acceleration, and is about to get new clutch/flywheel combo, go for it.
Personally I wouldn't do it unless you need to. I've changed mine at 41000km. Just wanted to change it to see what's it like.