You guys are a bunch wimps. A properly broken in clutch type with additive shouldn't chunk much at all. My older cusco 2 way doesn't at all and locks like a champ.
Some used diffs may not have been broken in properly, someone buys it and reports that it clicks -> therefor "all" clutch types make noise. Granted some of the higher end diffs ie ats, kaaz, etc with higher tq break-aways may be more noisy and aggressive. Don't forget lots of oem cars had clutch type lsd's.
HLSD's still one wheel when one wheel is off the ground.