Let's start by saying that the BOXi T-200 has all the elements to be a very practical tiny projector. It's bright enough, with about 150 lumens maximum, and 120-130 lumens in the best looking modes. It has a very respectable picture quality that makes it very suitable for both small group presentations, and for home entertainment, including gaming. It may also work commercially as a small digital signage solution, and the fact that it is pretty short throw, and can do rear projection as well as front, and be ceiling mounted if needed lends it to a number of signage opportunities.
The trick, when choosing among pico and pocket projectors, is to understand what trade-offs you are making relative to bigger, "traditional" projectors.
Of course, those traditional projectors are far, far larger, but not always far heavier. Do you want the the lightweight, tiny footprint of a projector like this, or will you be happier, with a projector that might weigh 3-4 pounds, be huge by comparison, but have 2000 lumens.
BTW, when we're talking weight, although this BOXi T-200 projector from Elmo, weighs about 2/3 of a pound, it also has a brick type power supply (like many laptops) that weighs about as much as the BOXi, so figure you really are working with a "practical" weight between a pound and a pound and a half. That's still far less than traditional projectors.
And of course, the T-200 DLP projector runs on an LED light source (R,G,B) which should easily outlast the practical life of the projector. I have yet to find a lamp life rating for the Elmo solid state light source, but most likely is between 10,000 and 20,000 hours. Even using the lower 10,000 hours estimate, that's 20 hours a week, for roughly a decade!