The Wattson is a lovely gadget which has quickly become a family favourite. I was really looking forward to installing the accompanying software so as to be able to upload historic data onto my laptop. Unfortunately, it turns out that the software won't work with Mac OS Lion, and there is no sign that the manufacturer is working to fix that. I have contacted them to ask the question. Aesthetically pleasing and informative though the Wattson is, it isn't worth this much money if the data is effectively inaccessible and you can't hook it up to a computer - so I've told them that I will be forced, reluctantly, to return it if a solution is not in sight. FIngers crossed.