So I purchased the HC1600 due to the phenomenal deals going on right now. I am upgrading from a 5 year old X1. Didn't worry about rainbow because my X had a 2x wheel also and they were not an issue. Love the picture on the 1600--very sharp and beautiful--but I can't blink without rainbows. Watched Deathrace on bluray, a rather dark movie, and about every 30 seconds I was seeing them. I was never sensitive before, saw them the first few days with the x1 but nothing that took away from the experience. They say roughly 5% of people see them, but everyone I have watch it (about six different people) all see them so I know it's not just me. It is so bad it actually takes away from what you are doing. Now we count rainbows. It's almost a game. Needless to say it is going back. I managed to snag one of the clearanced hd71's from CC. Hope it is better. I tried changing every setting imaginable (not new to projectors, fairly tech inclined) but nothing helps. Why would mitsubushi knowingly make such an unwatchable p.o.s.? Is it defective?