Question lang po... umiinit ba ang Xtreamer sobra? I've been playing 720p movies round the clock, with the fan set to off, so far I barely feel heat coming from the unit.
Everybody has a different operating environment. Ambient temperature, installation position of the Xtreamer, air flow around it, etc. can all influence the longevity of your Xtreamer (and most electronic devices, in general).
Those playing 1080p material will find that their Xtreamers generate more heat. I don't recommend operating your Xtreamer with the fan set to 'OFF', unless you have a passive cooler.
Excessive heat will shorten the life of your device. Keeping it cool, on the other hand, helps prevents damage and extends its operating life.