Basic said:"High power draw."
I think most of the power draw in CRTs comes from the electtron ray deflection system. But you don't need that in SED.
The link silence gave said that the power consumption was 2/3 of a PDP.
I find that one difficult to believe. That is the thing that I thought they would be bad in regards to btw. If it is really true, then whoopie I am glad I have been waiting...