Has anyone bought one of [[http://www.amazon.co.uk/Odys-Pico-Projector-iPhone-Projection/dp/B00A0J09S4/ref=sr_1_cc_1?s=aps&ie=UTF8&qid=1384285105&sr=1-1-catcorr&keywords=iPhone+projector these]] or one similar? Don't know if they are a good buy or not. Any advice would be welcomed!