Considering the speed of the Amiga's bus & the DMA issues the Deneb has with most configurations, I fail to see why it would warrant such a high price over an X-Surf 100 with RR USB add-on.
The only real thing over a slightly faster Deneb transfer is 4 ports over two but then a cheap USB hub in RR kinda fixes the whole thing, if it's a port count thing that floats your boat. :-)