my Apple AirPort Extreme gives me better signal and speed than the LinkSys at work... And I'm physically closer to the LinkSys and my desktop is the only other device using it (there are a total of 4 PCs on the network, but the others are hard-wired).
At home I have 2 iMacs and 2 iPhones on the AirPort wireless and 1 PC wired in to our cable modem. The new AirPort Extreme is EVEN FASTER... I'll probably get it when Leopard comes put in the fall.