I have an Edimax from Software Hut. It works fine but the settings were a pain to figure out. It took me weeks to configure Genesis correctly, but it was eventually worth it. Neither Genesis nor Miami would auto-configure. Instructions are unclear on manual configuration for both Genesis and my Netgear router.
You will need a router and PC to make it work. At least that's what my Amiga tech and folks on this forum have said and I vouch for it working.
If you need help with configuration, this forum is invaluable. I'll be glad to share mine with you.
I use an 060/50 and it downloads at up to 40,000 cps, tho 20-30,000 is more common. I guess it depends upon traffic. Without the ethernet card, downloading took forever, but I downloaded a 172 Mb file a few days ago that I'd never have attempted before.
Without a pcmcia conversion you will need to plug the ethernet card in after booting, but it's no real problem.