Yea. LIke Wolf said it depends on what you're going to use it for. Theres soo many out there, all with different features. like the brookstone projectors have device charging ability and can last for 2 hrs (May need to purchase $99 battery depending on model), or AAXA Technologies has an OnBoard Media player that can play files form MicroSD/USB and battery powered, or even a 3M Roku that allows you to watch those Hulu/Netflix channels if you're into that. Just really depends what you wana use it for.
To give you an Idea here are some good review sites with video comparisons. (take out the Spaces. LOL)
www . mini-projector-blog . com
www . micro-projector . com / micro-projector.com/2013/12/brookstones-hdmi-pocket-projector-review/
www . mini-projectors . net / comparing-the-3m-streaming-roku-projector/
If you just wana try one out you can get one discount from AAXA as long as you review it on a forum somewhere. You can always sell it if you dn't like it. LOL -> www . aaxatech . com / reviewprogram.htm
Hope this helps!