Whilst the projector didnt fair quite so well on the sound how many people will actually be using the speakers on the device itself. I suspect most people will actually use external speakers and connect via HDMI to their laptop or other external source. Its really a question of whats more important to you, sound quality or image quality and for us image quality is far more important and you shouldnt really expect to get a massive sound out of something thats already packing amazing image quality into something so tiny.
We always advise our customers to go for the best image they can afford as there is no point watching a projector if you cant see actually see it but you can always connect an external sound source so we would give the 3M 4 G rating.
The 3M MP410 is currently on special offer at Personal Projector Ltd at £389.99 including vat (limited stock available). Also see the 3M MP 220 Android mini projector also on special offer at £299 (Save £90)
Portable Screens: Pico Genie
The portable screens on the Gadget Show looked really great side by side. The Gadget Show used the Pico Genie 40" screens which are adequate for the lesser brightness projectors such as the Philips 2480 and the Optoma PK301+ but for the higher brightness projectors such as the 3M MP410 then its worth considering the slightly larger Pico Genie ultra portable desktop screens at 50" and 60". These are still easily portable and come in a carry case with a shoulder strap.
Video of the Gadget Show Mini Projector Review