opinions on unsprung clutch

[nando]

i'd rather run a stiff PP (like the sachs 618) and a sprung hub clutch on a DD, personally. sachs even makes a sintered sprung hub clutch (for M20s at least).

[jeffw]

I am putting one in and I know the difference but I am curious to hear from those who have had them in their cars. Did you like it? prefer it? just want some opinions.