hi, looking to buy rMPB soon (2.6/512/16gb). My daily work involves network support so need to play and test with many VM's and use GNS3 for cisco studies. Wondering if anyone out there has had a chance to use GNS3 on the rMPB and wondering how they find it? How are VM's performing, specifically multiple VM's running at the same time. How does GNS3 perform in general, does the app itself 'look ok' on the screen? Also have any decent terminal apps been updated to Retina standard? I know i wont be running it at full load all the time but would like to know how it handles in general. Many of the reviews seem to concentrate on Web designers, photo/video editors etc. Thanks!