I have been running my KLN for about a month now and have not seen an issue.  In fact I have had less trouble with it than I have had with some of my block erupters.  Its been running solid avg of 4.5gh/s @ 50C with <0.001% error rate.  That's about as good as my jallys (well before I overclocked them).  Currently running with cgminer 3.7.2/Win7 I have not tried it on the latest cgminer yet. 
From all of that has happened throughout this, SB you've been doing a great job!