Mine works fine, Sawyer. I don't play online, but I never have issues downloading demos or arcade games with it. It's never dropped any of those downloads.
Get the wireless N adapter they're selling now. It has two antennae.
It also depends on your setup. My buddy let me borrow his so I could update my system, and it's been a blessing because where my 360 is in relation to where my wireless router is makes it extremely difficult to connect, and I'm not stepping over an ethernet cable just to play games online. lol