I use a non-airplay compatible MacBook Pro from mid 2010 and I am rather disappointed at the overall product offering for these slightly older machines. While I find you can mirror the display to an iPad, it seems impossible to use one as genuine secondary display (such that it could be used for extra screen real estate). I paid for several products over the last few months only to be disappointed in this way. Perhaps therefore a niche could be to support older machines like my mid 2010 MacBook pro?