Good points, but let me interject.
Does FI work in 3D mode on the Optoma hd8300?
If FI works in 3D on the hd8300, then I would NOT BE LIKELY to take the Mits over a DLP with FI. FI is very important in 3D.
If the price were the same I MIGHT also take a Mits hc8000 new over an Optoma hd8300 refurb. The hc8000 does not have FI in 3D. Also, Zombie has specifically stated that much like the Mits hc4000, the hc8000 also has a focus uniformity issue in the lens, it is not as sharp as the w7000 and I assume not as sharp as the Optoma hd8300.
The reason I bought the Benq w7000 instead of the Optoma refurb is mainly 3D brightness and because I know FI works on the Benq in 3D. The Benq still has the edge over the others in 3d brightness, especially with my setup given that I have an HP screen.
I really think the blacks are bearable in 3D mode on the w7000 (I know it sounds dumb), but I mean let's just say MOST of the time they are bearable, because you can use the IRIS to get the brightness and white peak exactly right even as lamp ages.
So let's say on another PJ you have to put up with it being 20% too bright, this will make the black floor look worse for X hours, then if it gets too dim you will just lose the punch. The Benq has MAX range in all modes because of the service menu accessible IRIS that can be used like a manual IRIS, manual IRIS even works in 3D, and I've been tweaking the service menu to try to get the w7000 up even BRIGHTER in a 3D mode (haven't gotten there yet, but I'm working on it).
I am pretty sure (although not positive) that I can override some of the default 3D calibration settings in the SM to force a brighter 3D mode (potentially even to match the Epson), but like I said this is a work in progress and I'm sure there will be some green/blue side effect to the image. I probably will not have this completely figured out until my lamp ages enough to where I feel like actually doing it.
Overall, for 3D, the Benq w7000 is very good, do not run away due to blacks only. Also I think I MIGHT be able to get the DI working on the Benq in 3D mode if anyone cares, even though DB was disabled on the menu, I was able to fiddle in the SM and saw the IRIS working 3D mode, but it did not hold the setting (so I'll have to re-investigate).