I was lucky enough to pick up and A4000D with a Deneb card inside and I'm amazed at how well (and how fast) it is.
The difference between USB 1.1 (Subway) and the USB 2.0 of Deneb is massive. If you're planning on using your USB for mice and keyboards only, then you'll be fine, but using flash drives or external USB hard drives or CD drives and you'll suffer...
Moreover, you get those 4 MB of flashrom for free and the Deneb is the only card to provide realtime ISO support, which means you can use USB Audio and USB Video, which the Subway cannot.
