I already marked up Mirimir's other thread enough. I loaded Qubes on an external today and took the first few steps. 1. Pleasantly, the distribution does a great job with DM/LUKS so the entire OS is wrapped in solid encryption. 2. I could not load the OS on my usb flash. The distribution looks for free space/unallocated on a device. Windows will not let you delete and/or multi partition a flash drive. Even after deleting the partition using a nice partition wizard the partition was still seen to be there. I may go back in a day or so using Linux and mess with partitioning the flash, which windows cannot do. I am mentioning this to help others assess ease of use for an "average" computer user. You will have to prep a flash with linux, if that even will work. In a few days I'll report back on this step if I get around to it. 3. I had no issues at all installing the OS on the free space of a usb external drive. As you know, windows can easily partition a usb hard drive, which is handled differently than a flash. I free'd up enough space to easily accommodate Qubes. 4. The speed is beyond my ability to accurately report on because I threw this trial run on an older usb2 external I had laying around. Still the page loads were decent and it seemed peppy!! I am virtually certain the speeds would be awesome installed true bare metal on this machine. USB2 is "snail mail" compared to my USB3 drives. Unfortunately I only had a USB2 available. 5. Initial observation; this OS is absolutely NOT created with a normal home user in mind. If I gave this to my friends or brothers it may as well be written in a language they don't speak. I was easily able to log online and cruise around, but then again I live on computers. 6. TouchPad - I was and have been unable to get "touchpad" settings on my laptop to work acceptably. The mouse portion is slick and smooth but I have to hard click the touchpad to open things. I would never subject my touchpad to that treatment long term. I did open system settings and played around with all the touch pad settings (the OS saw the correct touchpad by name) but it didn't seem to help. Caveat: I plugged in a conventional usb wired mouse from my desktop. It worked flawlessly and in fact better than on my desktop. This laptop touchpad clicks by just my finger weight using Ubuntu 12.04. The debian drivers are exceptional for this device. I may look into copying over the drivers but for now that is beyond me on the OS. 7. Learning curve promises to be steep based upon my simple 2 hour test drive. For home use of untrusted internet and general surfing I had it up in under 10 minutes. Graduating to tunnels, etc... it would take some learning "pains". I read a bunch and understand what they are doing via a "black box" presentation. It is another thing to put the rubber on the road with it though. The theory is amazingly secure and I love the concept. I would be interested in hearing some observations from anyone here that has tested this OS.