Emphasis on LAP. I'd pick up a rMB that would mostly be used around the house or when traveling. I looked at one at the store and my concern is its too light, too narrow to be used on the lap. I work on a rMB Pro 13" now and the heft does help a bit in keeping it planted on your lap. Another place it would be used is in data centers and at customer sites so a lot of times I'm propping something up sometimes precariously where there is room. I'd be concerned about even the weight of an ethernet cable and dongle plugged in pulling it over. A light tug which may not budge a heavier laptop but something feather weight might move it quite a bit.