We had a chance to test and compare two models: ViewSonic PA503S vs Optoma ML750ST and this review should help people who are looking for a good projector. Based on our rating, PA503S has a total rating of 5.6 out of 10 versus 7 for ML750ST.
Advantages ViewSonic PA503S over Optoma ML750ST
Bigger projection screen size: 30-300 inch vs 30-80 inch
Better brightness: 3600 vs 700 lumens
Advantages Optoma ML750ST over ViewSonic PA503S
Lower noise level, 22 dB vs 34 dB
Lower power consumption, 77 W vs 260 W
3D support
Longer lamp life (normal mode): 20000 vs 5000 hours