I also found colour tones sometimes looking slightly odd in tone. This is especially the case when watching DVDs, but even the often unsophisticated palettes of Wii games aren't wholly immune.
Next, while Wii games look decently sharp if you've got the console set to output 4:3, DVD and widescreen digital TV pictures tend to look rather soft if you're doing the right thing and watching them still using their original widescreen aspect ratios. Especially if you try and compensate for the black bars above and below the picture by adjusting the optical zoom or projector position to make the main image content look bigger on a wall.
Finally, if you're watching an image of any decent sort of size, you can definitely make out signs of the DLP mirror pixel structure in the image, in the form of a vague mesh-like effect.
Turning to the speaker package included with the GT3000, it's just about functional, I guess. Well, maybe it's a touch more than that as it can make itself heard above the squeals of delight of young and elderly relatives alike as they get another strike on Wii bowling. Oddly it's not bad with poppy music, either.
But I wouldn't recommend using it while watching a DVD, as it distorts very nastily and quite regularly in the mid-range - i.e. where most vocals hang out. In other words, if you happen to be using the GT3000 projector in a room which has any sort of other audio system in it that you could connect your Wii or DVD player to, then I suggest you use it.
Another day, another nightmare of a conclusion to reach!
The problem with the GT3000 is that despite claiming on its box to be great with movies and sports as well as games, it's really pretty much a one-trick pony - with that trick being that it's actually quite fun to use for Wii parties. So long as the members of your party aren't all particularly susceptible to the DLP rainbow effect.
I guess the GT3000 could also just about work as a ‘young kid occupier' if you stick on a Disney DVD in the afternoon. But for god's sake don't expect it to come even close to satisfying any more serious home cinema cravings than that.
In the end, I guess the question for you has to be whether playing life-size Wii games is really worth £338 to you. For me, it probably isn't. But then to be fair, if you play Wii games as much as I play Xbox 360 and PS3 games, maybe it just about is.