I installed my Carada BW screen material today (1.4) and closed the Iris to about 90%. I was able to keep it very, very bright. I haven't had any problems with dimness at all, in fact, sometimes it seems a little bright. I thought I would have a little more trouble with brightness coming from an infocus PJ but this thing is great.
I'm no expert, but going by what my PJ is performing, I'd have to say it was the defect.
Aspect ratios are changed as soon as I push the button, no delay whatsoever. Also, I can change between inputs without delay (besides the "searching for source")
I had an experiment tonight by turning the PJ on and letting it run without a source for five minutes....no freeze ups or lock downs at all, worked perfectly