I find his prices on soft focus lenses to be very high. There's no doubt the market for these lenses has gone up significantly in the last couple years, but you could easily do better elsewhere with a little patience. On the other hand, if you Gotta Have It Now, he's got some cool stuff.
If you watch eBay (perhaps a little too closely) you will see what he gets some of the lenses for, and what happens when he can't sell them on his site.