I have also seen some reports of these catching fire, so I would beware with overclocking them which only increases the risk.
i have an ant that has been running non-stop oced @400 since December last year without any problems. it is located in a 60 degree datacenter. i now have six ants altogether with three of them oced @400. i have still yet to oc the other three and have been considering ocing them soon. i am thinking of ordering some of the aluminum heatsinks for these maybe. i am not sure if the downtime from mining would be worth it though since they seem to be running great. i heard rumored three degrees cooler with the heatsinks though.