I'm gonna nitpick a bit here and just say that I think the rating is way to high for this projector, or that the review under-states just how important the specific usability of this projector is.
VGA OR composite OR iPod - It's an extremely portable projector - but it is NOT a home theater projector. It's basically a $500 decent toy.
If people are looking for a home theater projector, there are commercial projectors which are cheap SVGA or XGA models right around $500 with more connectivity and enough lumens to easily handle a 100"+ screen.
Moreso, for just a couple hundred bucks more, you start hitting the cheapest 720p home theater proejctors which can output about 10x the lumens at their brightest levels, easily filling 100+ inch screens with true HD glory and with the connectivity which is proper, and required, for HD viewing.
MY OPINION:
DETAIL AND RESOLUTION: 2 or 3 stars - this is an extremely low resolution projector by todays standards, it may be sharp and produce those pixels (at 40") nicely, but it is extremely subpar.
CONTRAST AND BLACK LEVELS: 4 stars, or better - DLP tends to be excellent at this.
COLOR REPRODUCTION: 4 stars - DLP is also great with this when properly implemented. No suprise.
BUILD QUALITY: 4 stars? Sure, maybe more even. I haven't seen many projectors which have been shoddily built.
ERGONOMICS/USABILITY: I'm not sure what this means exactly. It's a box, just like most projectors are boxes. It's not extremely bright, so it is limited there. It has no lens shfit, no zoom... Not sure why projectors have this category overall, but this projector certainly fails in ways which other projectors do not, but it gets major props for doing what it does at the size it works in.
Ease of Setup: 2 stars - Sorry, this is not a five star ease of setup projector. Ease of setup needs to allow for exactly what was discussed above and on a projector it is easy to setup when you can zoom in/out, have multiple connections at once, and use lens shift instead of keystone correction. This is about as bad as a projector can be for 'ease of setup' on the market. It is more reminiscent of an old CRT, but it weighs less and doesn't have as many inputs.
Features: 3 stars - Once again, this is a projector, and compared to other projectors it fails at every level EXCEPT FOR SIZE! Correct that, size and lamp life.
Fit and Finish: 3 or 4 stars - Not sure how many ugly projectors there are on the market, but part of the fit/finish is the requirement for that big ugly power supply which most projectors don't need.
This is a 2-3 star projector in my opinion when compared to the field of projectors which are out there. Most notably, the lack of a HDMI input and extremely limited versatility in setup.
BUT!
When compared to similar PICO projectors, I think it is exceptional! This is an incredible travel projector and with it's super small size, ability to run straight from USB, and iPod connectivity with small speakers included, as well as VGA connectivity, you do get something which is great for the traveller to use in their hotel room, the family to take on vacation, or to show the emergency business presentation when people don't want to gather around the laptop screen.
But, I do consider it a projector first - and for that, it's a long way from a 4 or 5 star product in most regards.