I have bought a couple of things from him and they have always been as described. As fo his prices, they are high, but that's where he has placed himself: at the top of the market for this esoterica. If you need something that is a little out of the ordinary, say a Konica AR 57/1.2 [or insert your own exotica here], Kevin often has one in great condition for a price. In my limited world of "where do I find it" he defines the tippity-top of the market. I don't buy from him often, but when I do I am glad that there was someone with a good track-record to purchase from. I'd much rather do that than trust to an e-bay transaction for an unusual item. There is so much less certainty in that forum and no way to ensure when you are bidding that you will get the item question when you need it.
So go in with your eyes open, but if you really need whatever it is and KEH isn't stocking that flavor this month, be glad that there is a source for this exotica.
<a href='http://www.rangefinderforum.com/photopost/showgallery.php?cat=500&ppuser=1566'>My Gallery</a>