I have it one the MicroSD in my Android phone. I also have MicroSD-to-USB3 card reader on a keychain. Easy to boot any PC. Running from RAM is fast and leaves no traces on the host PC. One feature especially worth mentioning, is that you can have AMD and NVIDIA drivers in /porteus/optional and depending on the detected GPU, porteus will load the required driver. So far, it worked everywhere except for some Atoms (netbooks) with PowerVR GPUs.