I received my Stream yesterday and set it up. I put it on top of my router. It worked perfectly for a few minutes but after about 15 minutes my downloads started failing, the one download I was able to get to complete gave an "unable to play recording error" and I couldn't get it to stream anymore.
After a bit of troubleshooting I noticed my router was sending off a lot of heat and the stream was extremely hot. I moved it off the router out on it's own and it started working again.
Looking at the box itself it seems to be all air holes and a fan. I would be very careful about putting this into a poorly ventilated cabinet cabinet or on/near another AV device that gives off a lot of heat.