New W6000 owner here, via the Amazon deal that nearly matched the PP deal. (And now up $200 since I ordered on 12/22.)
Briefly, my situation: I've had an Optoma HD80 for just over 2 years, and about 2 weeks ago it started having the well documented problem of powering itself off when HDMI signal is dropped or switched. It's out of wty so I'm currently SOL, though hoping to get something more. Prior to the HD80 I had a couple of NEC business class projectors, so I lived with rainbows for 4 years and put up with them, but rarely ever saw them on the HD80 which was a huge relief.
My HT setup is a typical LR type setup - white walls/ceiling, incomplete lighting control during the day. Screen is a 100" Firehawk G3, which helps. I watch some of everything - movies, HDTV, sports, sometimes PC stuff (less now that I have an Apple TV). So, typical needs for that - brightness needs to at least be available, but I do want at good black levels. I am greatly looking forward to the advent of LED based projectors in this price range, so I had planned to keep the HD80 until then.
After determining that the HD80 was not going to be a quick fix, I ran over to Best Buy and found they had 1 Epson 8100 in stock, so I snagged it. After some setup and tweaking, I found it to be a very different look than the DLP I was accustomed to, in part because to get the black levels to be acceptable the brightness was down so far that the picture was a bit dim and dingy looking. I ended up using the "Theater Black 2" setting as a start. On bright material like sports or animated features another mode such as "Living Room" works ok, but anything with dark scenes is not good due to elevated black level. For the price, it's a good projector and I could probably live with it for a while but I know I'd always be looking for an upgrade.
Enter the W6000. I had started reading this thread after reading Art's review, saw the Amazon deal, and snapped it up with 2 day delivery. So I've had a couple of days to compare it to the 8100 - which isn't really a fair comparison of course based on MSRP and it really should be compared to an 8500, but it's what I've got. (I've never had this opportunity to compare/contrast before, and it's fun and educational.) To cut to the chase: in every meaningful way that I can see with ONE major exception, the W6000 kills the 8100 - and it should. I love the sharpness and brightness, and I can get the black levels pretty good and still retain nice brightness. However, that brightness comes with a price, which is that I'm back in rainbow land. Having lived a nearly rainbow free existence with the HD80, I have to say I've gotten spoiled and it sucks to go back. I may be able to put up with it in exchange for the many other advantages of the W6000. I love the lens shift - I was never able to get the HD80 quite lined up right.
So now this has me wondering how the 8500 or something like the new LG CF181D SXRD based model would do. I am guessing that the 8500 would be more similar to the 8100, unless it can retain better black levels in the brighter modes. The LG sounds like it has pretty poor black levels regardless, so while I've always been intrigued by LCOS and enjoyed the look on the couple of occasions I've sampled it, I'm not sure the LG would be a good fit esp. on my 100" screen.
Bronco70 mentioned not really seeing RBE on the W6000, and I really envy him. I'm having a tough time with this now because of this one flaw. I've been able to mitigate it somewhat by backing down on brightness and on contrast (interestingly, my eyeball adjustments ended up very similar to those posted by Digital2004.) mp06011999 was asking about this, and based on my experience I would have to say this is definitely not the pj for you, unforunately. If anyone else has suggestions to further improve this issue I'd love to hear it. I'm going to live with it for at least another few days before making a final decision. (The 8100 is going back, so I may try to grab an 8500 or CF181D soon too and compare.)