to be honest ive never had any brand router fail, other than cause by user error (the old linksys's used to erase their firmware if you rebooted them over and over again).
otherwise the linksys ones we used in our stores (WAG54G i think but thats an old model now) were fault free concidering they provided the connection for all retail outlets and polled sales/stock info back and forward 24/7, the only reason we got rid was an upgrade to Cisco units.