I've done Uberman for 2 months at a time. I've found I can be highly effective in certain areas - like coding. However, the brain needs quite a bit of sleep for memories to stay longer term - so this isn't ideal for students or study. Another caveat is that your metabolism increases but you usually overcompensate consumption-wise. A lot of people that persisted with this for longer periods of time, gain quite a bit of weight - so if you're ready for that. Good luck with surviving the first two hell weeks. :)