I end up buy this Epson as it have the combination I be look for : size : as I need something very portable . money : as I do not want to spend over $ 600 . clarity : as I need to do PowerPoint presentation in well light medium size room with audience from 5-70 . I would say the this projecter exceed my expectation in all 3 category . the size be smaller than I expect . it fit perfectly along with my MacBook in the same briefcase which be not that big . the usb connection to my Mac work great and no setup need . it connect to my Mac via usb and via the include video cable -lrb- of course you need to have the MAC video adaptor if you wih to use the standard video cable -rrb- . calrity be great and the picture be sharp in the native 1024x768 resolution , enough in a well light room with a screen size of about 100 '' use economy mode . the only caveat be the fan sound be a bit loud , so in a smaller area it will be noticeable and will require you shift to economy mode , which be extremely reasonable . my thought be the projector small size have to do with the fan be noisy as there be no easy way to discharge so much heat through a small opening without much noise . lead projecto size be so small be tempting , but be a bit on the weak side for daylight . I check all of they -lrb- Optoma , Viewsonic , Acer and LG -rrb- . Casio be awesome but cost be -rrb- $ 800 , and the fan get a bit loud on this model as well . to get something in this size in lcd , I would have have to go to SVGA -lrb- 800x600 -rrb- . so for a combination of size , clarity and cost , this one be the best I could find . for $ 500 , this be a great deal . the carry case that come with it be great look and very functional , although I do not use it as like I say before - it fit in my pc case with ease . bottom line , if you need something that to use for powerpoint presentation and travels in the same case as you notebook , this be the one . it be easy to connect , it turn on and shut down super fast , and it auto correct its positining in a smart way . for the clarity and size , it be worth more than $ 500 . if you do not care about the size , there be many other option that will not be as loud as this one .