So I decided to go with the 5010 and received it yesterday.
First impressions were pretty bad, as it took a very long time to setup.
Out of the box the lens was tilted somehow so that when vertical lens shift was at it's maximum height, it was still pointing at the floor.
Seemed to be something to do with the zoom and horizontal lens shift, eventually got it properly centered, but found the using the lens shift to be very hard to use, as the vertical, horizontal and zoom are all tied together. For example, if you have it shifted left, when you zoom, the zoom won't go 'straight' but will instead zoom in the direction it's shifted, so you will need to shift it back to the right after you zoom. If you shift it up while it's shifted to the left, it will shift it to the right, and you will have to shift it back to the left, which will shift it down and so on. Overall it was incredibly frustrating compared to my previous projector setup ( AX200 ).
That out of the way, it was a much better experience, with a signficantly improved image quality over the AX200, and interestingly, it was also a lot brighter than I had been led to expect by the reviews. Cinema mode is comparable to the 'Vivid Cinema' mode on the AX200, which was very bright. Switching the 5010 to 'Living Room' mode, the windows desktop was like the light of the sun - the room was much brighter than my electric lights can make it. ( 133" 1.3 gain screen ).
Trying out dual stream and SBS 3D from some HTPC sources it worked very nicely, other than the need to manually switch the projector's 3D mode to Side by Side.
This is where my largest annoyance to date reared it's head though. For some reason, if you switch the 3D mode to SBS and then turn 3D off, it still expects SBS images even though 3D is off, and chops up your 2D, which obviously looks terrible.
I thought I would give nividia 3d settings a go, as they apparently do the 2d to 3d switch automatically. This turned out to be true, but the only way that it works is that the video settings are always in 3d mode, even when showing 2d content. This means the projector is stuck in it's 3d mode, which disables CFI and iris.
Overall it's a lot more painful to switch back and forth from 3D than I thought it would be !