New Kistka Tips

I'm splurging on some new kistka tips.  I'm also trying a new supplier:  www.polartcenter.com.  I am hoping that these are better than the last batch I got.  I suspect it is a matter of preference more than anything, but I found that the brass kistka tips clogged far too easily and "freeze up" more quickly than the stainless steel ones that I am getting now. At least I hope so...