I have v3 of the router. I've tried the linksys firmware, plus just about every iteration of 3rd party firmware out there. It's been so long since I've used the Linksys firmware however, that I couldn't tell you if there's any QoS built in, however all the other versions of the firmware out there have QoS in place so you could prioritize traffic, thereby allowing you to browse the web and use other high traffic applications. check out http://linksysinfo.org if you haven't already. They list 3rd party firmware compatible with v5 of the WRT54G re: WRT54GS The "S" in WRT54GS stands for Speedbooster. That feature helps throughput for wireless clients using a compatible "speedbooster" wireless adapter. Other than that, there is no difference between the WRT54G and GS other alternatives: if you just can't get v5 to work correctly, D-Link makes an excellent gaming router. You check that out here: http://games.dlink.com/ . They run between $125-180 on pricegrabber