I put a Cree in the Osram GD... its fantastic!! Glare is reasonable (barely tho!) as the dome is frosted and mine got extra frosted from superglue fumes. You can additionally stick translucent tape on the outside like I did for my RR. But no matter what, if you want a bright area light from such a small source, it's bound to be glaring if you look straight at it.
4AAs isn't too much of a problem for me.