On their website they list every one of their clutches as having harsh engagement or worse. Just Google peoples experiences with "sprung versus unsprung" (takes about three seconds to figure out which is the harsher ride and least popular for a regular street car). I can only assume that you're either talking to people who don't know what's in their car to begin with, have soft pressure plates (in which case a sprung plate would probably feel rather mushy) or gutless power plants. I'm not guessing; I've driven many of both and in several cases tried both in the same vehicles... unsprung are harsher and if the whole assembly has a lot of grab may make a car miserably jumpy. In the end the overall feel comes down to the complete assembly (flywheel, pad configuration, contact surface area, pressure plate and clamping force) but no matter how streetable either one may be the unsprung clutch plate is the harsher engaging and transfers more shock to the drivetrain than any identical unit which is sprung.
I'm not really posting this for your benefit anymore. You've chosen what you want and it may or may not work out well for you and your setup. I'm posting this for future readers.
Don't forget to get the flywheel resurfaced.
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