I have had a plug run fine for over a year now at 110V with USB memory stick, and another one (without USB-load, but with somewhat heavy overall system load) just failed after less than 3 months (blinking light, otherwise dead).  Replacing the power supply worked just fine (now using an external one).  I have posted a picture of the broken one (since some of you asked for one): http://grothoff.org/plug_psu_broken.jpg