The Fibulas brake very well. As well as Dura Ace may be an exaggeration but I'd say they are >95% of Super Record which for all intents and purposes is more than adequate.
Now, my issues with the Fibulas were: they seize in gritty rain rides and the rear return spring is a tad weak. I couldn't get enough of the friction out of my rear brake cable run on the Evo to reliably have the Fibulas open. I didn't have this issue on the Litespeed so it may be isolated. As far as durability in the rain, for a dedicated light bike or a bike that won't see the rain, that's fine. Since the carbon parts move on each other, a minute amount of fine grit will cause the brakes to stop returning to fully open. I'm curious if the new ones are better in this regard (as well as stronger return springs).
As far as the weight goes, that's about the same as my old versions, which were 143g. You're getting supposedly stronger brakes with a cam to adjust to wide wheels.
agreed. that said, i pulled the THM Fibs off and put the EEBrakes on and happy that i did just for the reason that i ride in all types of weather. and when the grit got into the Fibs...the springs weren't quite strong enough to return back to where they should be...and would rub when i got out of the saddle. had to clean them quite a bit...lube the pivots to make them smoother and return.