Lightweight flywheels ?

[Kompressor]

Ok i have a my custom unorthedox lightwieght flywheel that I believe is half the weight of the original, this is the second one ive owned, this one for my mercedes my first one for my focus, i have yet to get one on one of my cars though. the one i just was gifted for the mercedes a friend of mine had made special but he sold his car and now I have all his old parts.

the flywheel is pretty new only like 10k miles on it. a few questions should i have it resurfaced if so then why and if not also why not.

now some general questions, per my friend having the flywheel on the car freed up 8hp and 9tq per dyno testing, this sounds good to me but I am also more interested in faster revs, and crisper shifts with the clutch im going to buy. what i want to know is the benifits/risks of using lightend flywheels, or in this case manufactured lighter to begin with its all aluminum except for the friction surface. the stocker is all steel. I believe this flywheel is half the weight of the stock piece, stock is like 27 pounds this one is closer to 16 pounds, the only drawback i can think of is faster revs mean i loose rpm's faster too but i can learn how to drive it.

heres what i have been told about lightwheight flywheels

benifts=
-faster revs
-less rotating mass= more usable power
-less weight on bearings=longer bearing life

problems=
-if its too light uphill travel or maintaining speed can be a problem
-revs can fall off too quickly while shifting if its too light for proper power band usage

I assume this one is not too light, Im guessing someplace in the 9 pound range or lighter id have the negative effects. so who has em who likes em and who knows the details about them.