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My experience is not exactly with a FR-S/BRZ/86, but I had a lightweight flywheel on both my old VR6 turbo and TDI. I actually preferred the drivability. Having the revs rise/fall faster helped the engine feel much more lively and got me going from a stop half a second quicker since I didn't have to wait for the engine to get its ass moving. It was also nice while pulling into a parking spot or other situation where I'd give it a little bit of gas/quick poke with the clutch to keep the car moving. Instead of the engine hanging and making a ton of racket, it would quickly drop back to idle so I didn't look like some jerk trying to show off.
The only downside I noticed was the chatter from the clutch was more pronounced (especially on my TDI). I didn't mind it, but it might bother non car enthusiasts who don't love hearing the noises their cars make. It definitely isn't as bad on gasoline powered cars as it is on diesels.
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