1. This projector is a POS. Once again, a manufacturer without professional reviews of their product and a solid base in the USA should be avoided. You are going to feel like you have wasted your money when you have even the smallest issue and there is nobody there to support you.
2. NO LED projectors are that bright when measured. Most of these BS claims end up delivering about 1/10th of their claimed brightness (see the recent Projector Central article).
3. You do NOT NEED A SILVER SCREEN! Come on people, most of us who have been around for a while should know to check out any number of websites to read about the different screen materials, There are a number of screens which have been developed in recent years which retain image polarization while still delivering a solid 2D image as well. A big headache of passive 3D was that the screens from a few years ago (silver) looked terrible for 2D, but worked very well for 3D only. So, for 2D watching, you had a bad image. This has been corrected by some very good passive 3D screens which are not riddled with the poor quality of silver screens with 2D material.
Basically, just trying to dispel that myth of 'silver screen'. The key is getting a screen which retains polarization as best as possible.
4. Is passive 3D actually better? IMO, not at all! I have never seen a movie in a commercial theater which retains 3D nearly as good as DLP Link does. I typically watch at digital IMAX theaters, and have seen any number of other versions, and it is DLP Link which actually maintains proper eye-to-eye separation with zero crosstalk between the images. While the glasses may show flickering to some, I don't see it and the jump in quality I get from active 3D is well worth it. I have only minor brightness complaints, but I am watching on a 161" diagonal screen. At (a fair bit) under $1,000 for the projector and 4 pairs of glasses for my family
it seems like it makes more sense to use this projector and get 20 or 30 pairs of glasses instead of going down the 'passive' 3D route.