Brightness is definitely diminished, but if you are willing to push the pj a bit harder (brightness 50-55, contrast 70-80) the picture is still very enjoyable.
I have decided not to burn out my tubes and went to a 2 projector setup. I bought an Acer 5360, which displays 3D flawlessly with the VIP 3d-theater. Brightness is not an issue with the Acer with 2500 lumens. PQ on the Acer is very impressive at this price level. I use the Acer for 3D and gaming and save the Barco for 2D movie watching.