I have had mine for over a year now, 14 months to be exact. Great laptop, the heat issue is a non-issue. Only problem I have had is the rubber feet falling off, but Apple fixed those for free (I took it in to an Apple store and they fixed them on the spot). Oh yeah, the AC adapter went south too, they gave me a new one. <br><br>No experience with the 1GHz one. <br><br>