I had a BenQ for a few days, but it went back to AVS in trade for a Sharp XV-Z20000, which I loved and used for several years. I just gave it to a niece a few months ago. The BenQ W7000 also seems to be hit or miss when it comes to quality, so it may take a while to get a good one without issues.
All the JVC projectors ghost. They use basically the same panels in all of them. I owned the RS40 and RS45. The only projector technology that can be completely ghost free is DLP. There's a big comparison thread here on AVS about Sony, Epson, JVC, BenQ, Panasonic, Acer and a couple of other projectors. It explores their 3D performance in detail. The newer ones (X55, 65, 35, RS48, 4810) match more closely the first gen JVCs' 3D performance, which ironically was better than the second generation (RS45, etc.). They really screwed up last year, releasing projectors whose ghosting performance was abysmal. I loved the JVC's contrast, but the ghosting led me to trade my RS45 to another AVSer for his Epson 6010 last year. Except for DLP, it's the best projector I've seen in terms of ghosting.
My LG passive display is better than any projector I've owned for ghosting, but is still behind the DLPs. It's contrast is also weak compared to the projectors, although I still prefer it to the Samsung plasma for most 3D films, because of the brightness and how easy passive is on the eyes.