This man is spot on! I got the ECS stage 1 kit with the 14lbs flywheel. Biggest mistake I made as I'm the same, I notice the little things and believe me the rattle is noticeable, not just on decelaration but also in aceleration at the lower rev range. Once you got the revs up and the car plodding along then the rattle isn't obvious.My recommendation would be to stick to a G60 flywheel. They are about 1lb lighter (@20lbs) than the DMF and as I've mentioned a lack of refinement creeps in certain situations. The ECS is 14lbs IIRC!!!
With much lighter flywheels you'll get faster throttle response but the RPM will drop more rapidly when you come off throttle. The car will slow down significantly quicker when lifting off making it less of a pleasure to drive IMHO.
Also neutral 'rattle' and coasting noise will increase significantly. Some people don't mind the reduction in refinement... but it's not for me!