Over the past few weeks I've mentioned in various threads that I'm looking to get either a 30 or a 56 and was going to do an A/B demo at home: several people have asked that I post my 'results' once the test was done, and for what it's worth here they are! The 30 has a larger image, but that's its only advantage. I wasn't really aware of rainbows on either machine, but then I could be one of the lucky ones who doesn't see them. That said, the other differences between the two machines are HUGE. I cant stress enough how much better the 56 is than the 30. Its easily worth the extra 500 quid, if not significantly more. More to the point, I wouldnt say that the 30 is worth a grand, no way. I found myself watching the 30, and wandering what all the little white blobs were that I could easily see: so clearly in fact that I could see the little black dots in the middle of them. I realised with horror that they where the pixels, and the black dots where part of the mirror mechanism! This was all viewable from the watching position (ie approx 2 times the screen size), but obviously was more visible close up. I found the 30 totally unwatchable, and would advise anyone to demo before committing more than a grand on something that in my opinion isnt watchable. It seems that even though the source (DVD) only has a resolution of 625 lines, having a projector that only displays this resolution means you can see the pixelation of the projector, which on the higher resolution 56 is much less visible. I would say that you can still see the artefacts of the mirror array on the 56, but only if you freeze frame and search for them in a particularly bright scene. I would assume that going even higher in resolution would make this less of a problem. I did not see any evidence of the source pixelation. Im very surprised that I found the 30 so bad, particularly since its had so much praise and good feedback on these forums and elsewhere. I was expecting better, but I suppose that its horses for courses this is an example of words like fantastic and crisp and depth of colour meaning different things to different people! My advice is: DO NOT buy an H30 and spend a further 400 quid on a screen: youd be MUCH better off with an H56 projected on a matte white wall, which costs more or less the same, but will give you a higher resolution image that is significantly better quality. I cant stress enough try before you buy and make your own discoveries - with something as unquantifiable as your eyes, you simply can't make a decision blind (so to speak)! Mat ps - thanks to John at Admiral for bullying Optoma into the demo... stirling work and much appreciated... without it I could have made a costly mistake!