I got one in about 200kills but have killed another 400ish since then and nothing.
My opinion about the sheilds usage is , it works very well for my needs. With 100reflect phys dam suit(its reflect dam mod takes me too 100), 120 parry, nox/swords it works good especially against dexers but it always fun to see a mage paralysed, unable to do anything for that little bit makes all the difference sometimes against a good mage (if they not good then para is not needed).I can almost feel the mage's concern when a para hits them and they are not expecting it. A dexxer paralysing a mage is very fun to experience.
PS - that 100 reflect dam against a mystic can be very useful, not to mention those pesty archers getting 100 reflect dam is way kewl (this char was made especially to fight archers in the feild). My character that I'm talking about is red with 300 odd counts.