It's a nice change coming over from a bulky old windows PC the iMac can actually connect to the Internet wirelessly. I was thinking at the same time speeds obviously areceffected by being wireless though right? Do most people just use their Ethernet cable?
It is a desktop afterall I think once I get it moved into my office ill hook it up via the Ethernet cable.
I have both a Mac Pro as well as PC running Windows7 that I built last year; a major difference between the two platforms is with how each machine re-establishes itself after either waking up from sleep, or from a cold boot.
With the Mac Pro: wireless connections are re-connected immediately; no need for USB peripherals.
My home built PC: Hey, I love this machine (I built it), but it's got USB antennaes hanging out everywhere (wireless, bluetooth, keyboard/mouse interfaces), and I find that I always have to unplug/plug-in my wireless adapter to get it to work after waking from sleep or even a cold boot.
As for speed: according to my ISP's speed test, I haven't seen a difference...and finally, while I'm not a gamer, my son is who uses a beefed-up Dell, and, after converting that machine from wired to wireless he reports no noticeable gaming differences, at least with Combat Arms.
Hope this helps!