OK let me clear up some stuff here.
Heat :
The Myst does run a little warm because of the crappy cooler design, BUT with good enough ventilation it will not be an issue as the card is designed to exhaust air OUT of the chassis.
Performance :
Yes the cards is based on a cut down Tahiti, so its VERY similar in performance to the HD7950(vanilla, not BOOST). At one stage we never even could suggest getting the HD7950 unless people were planning to overclock, THATS how close the performance is BEFORE overclocking.
You will NOT max out ALL games at 1080p, but you will get very close.
Quality :
Other than the cooler, that card is of good quality.
Price :
AMAZING at 140$. Its the best performance you can get for under 200$