We had a chance to test and compare two models: ViewSonic PA503W vs Optoma HD27 and this review should help people who are looking for a good projector. Based on our rating, PA503W has a total rating of 6 out of 10 versus 7 for HD27.
Advantages ViewSonic PA503W over Optoma HD27
Better brightness: 3600 vs 3200 lumens
Advantages Optoma HD27 over ViewSonic PA503W
Lower noise level, 26 dB vs 33 dB
3D support
Longer lamp life (normal mode): 5000 vs 4500 hours