I have the new B3-A40 unit, it's nice, especially for the price ($130 at BestBuy) but for the life of me I cannot get the 2nd USB port to work (the one by the camera). In fact I could not get any access to the unit until I downloaded a driver for the B3-A30 as there are no drivers for the A40 unit on Acer's site. Still the 2nd USB port is useless (cannot charge or connect a PC to it). Also the charging rate is HORRIBLE. I have tried multiple cables and other USB chargers with a charge rate of about 10% an hour if that and only when the unit is OFF. Basically ZERO charge rate if unit is on--still a slight draw down on power when plugged in and in use. There is an awesome app for Android named AccuBattery Pro that give details charge rates, times, useage, battery cycles, life etc--that cannot see the Iconia's charge controller so you can't get any details. Tried other battery apps--the same. I know this is a issue with the model B3-A40 since I thought my first unit was bad and returned it--this is my second Acer Iconia One 10 in a week. ALL THE EXACT SAME ISSUES. Also I have applied BOTH OS upgrades and under settings it reports "all software is upto date". OK, anyone else out there have the same issues? Thanks, CJT, West Palm Beach, FL. USA.