my aluminum flywheel, a Fidanza btw, has exhibited no, 0, zilch, nada negative signs at all period ever. There is no problem with running it on a daily driver at all. I have had it in for many years now, and driven it in Portland, Seattle, and Vancouver rush hours with no problem. Drives like stock, but lighter. I have never felt any drivetrain vibration from the flywheel. Not sure how that would happen anyways but I have never felt it.
Of course you don't need it, and they are not super cheap, but if you have the extra cash, why not?
You will feel(and it will happen on any light flywheel) the difference on your first few drives. It will act like it wants to stall more easily on you, but you will get used to it quickly. This is not a "negative" effect really its just that with less rotational mass there is less energy stored in the assembly.
As well for mild setups, the Excedy clutches are good. Not sure I would use thier stuff for a wild build but for mild stuff they seem to hold up.
