I'd say they are suited to a certain purpose. When things go wrong or do not meet expectations it's either down to a lack of information/understanding and/or misuse. For racing conditions where you only make one or two starts, (off the line and pit stops), they're great. For start/stop traffic situations and general driving, they are less suitable.
I am sure the driving style of the other chap is why that clutch didn't measure up to expectations and was swapped out for an alternative.
Me personally, I will send my 68-110R off to Helix to be re-sprung to a 68-110G, so I can use a full face organic plate instead. It will handle the same torque but be much more suited to street conditions and treat the flywheel and clutch cover plate better.
As Paul said, light flywheels pose the disadvantage of a reduced thermal capacity, which can be a major downside when using a paddle clutch, especially on the street. Everyone is different, but I find in general a slightly heavier flywheel offers more advantages than disadvantages on a street driven motor, (within sensible limitations).
Bottom line, you have a very nice setup there that wont let you down and will ensure 100% to the road at all times. Pedal effort is increased but, from experience, it's perfectly manageable 
