Some older routers could falter after a long period of time, as they do sometimes heat up. Where I am, we have a circa-2006 Linksys WRT54G that sometimes needs to be lobotomized.
As for the model you described, looks like it's
more of a router.
Newer routers are cheaper, uses the new wireless-N protocol, easier to set up (including configuration for capped connections), can work with cable modems, but with bigger bandwidth in use these days (up to a premium of 100mbps), I think they're more than capable enough to handle larger amounts of peer-to-peer connections.