I recently got wireless internet connection, and it never disconnects and is really fast. Keep in mind im feeding the network with a cable connection. Download speeds vary but over all its been really good. Planetside is doing great, but when you enter a zerg you'll get bad pings for a couple seconds i guess cause the wireless router takes awhile to process everyone in the area. Similar if you were using a wired connection but a little bit worse. Zergs dont even slow it down. For Planetside it works really well their is only one concern, packet loss it says 2 percent but i havent noticed any warping even in outside zergs. Overall a wired ethernet cable is better but if their is no other way wireless has been working great for me. I will be getting a wired connection soon but, their have been some threads about this topic and i wanted to tell you my personal experience over the last past two weeks.
Setup:
Linksys 802.11g Wireless Router (Running 802.11b, thanks for the tip Marsman)
Linksys 802.11g (NIC)
P.S: 802.11b and g are backwards compatable