Hi, I'm thinking of purchasing a pro 4, though currently I'm still convinving myself to give such a big amount of money for it, but anyway I would use it as follows: 1. tablet/laptop at home for browsing, reading, blogging 2. tablet/laptop at work for office use, drawing, notes etc 3. lightroom raw photo editing (12mpx files) on a weekly basis, but purely amateur based I'm leaning towards de m3 because it's fanless etc, but I'm slightly worried if it will be able to do the lightroom stuff.. I currently have a imac 2007 with a core2duo processor, 4gb of ram and a ssd installed and the performance i get from that machine is fine for my use, if that can give you any indication. I had a macbook air 13" 3 years ago and that as well was performance wise enough to do my photo editing. So if the m3 is up to par with those devices in lightroom, speed wise, I'll be very happy any indication of a real world difference between the m3 and i5 in lightroom would also be very much appreciated! thanks!