Oh yeah. I tried a few before settling on LeeDroid. I am not overly worried about battery life as I am instructing the users to plug it in when in their mobile unit. (the van they use to go from job to job is equipped with an industrial inverter with a pure sine wave so they will be using the stock AC charger-mostly because of the expense of the 12V charger times 40 units and the fact that due to the shape they can't screw up plugging it in!) Leedroid is lightweight and on it's own fairly lag-free, but with this kernel and OC'd it flat-out flies! It is running very stable with at 1651 MHz. Even with the OC I wouldn't be surprised if it went 8 hrs with thier type of usage on a full charge. (they will use for gps guidence from time to time but mostly it will only be used once evey hour and a half at each jobsite) I have an app locker to keep the users out of apps that I don't need them to use, a WiFi timer to keep them from using up our bandwidth while off-duty, and Boat browser for a faster browsing experience but with strict search settings locked and password protected. Much of this can be overridden of course, but most would have no idea how. The worst that can happen is I have to hard reset and sign them back into the Google account, and the two other apps that I have chosen that require a user to sign in. (Groove IP and Zello) We are experimenting with this setup until we make our own custom ROM. I have paid a "developer" here (XDA) to develop one, but after several hundred dollars (more that 1200 of them) and several weeks all I am getting is a run-around and still do not have a working ROM based upon the specs that we agreed upon.
But about the WiFi timer to keep them from using up our bandwidth while off-duty...The WiFi timer would be a lot more effective if I could figure out how to customize the menu accessed by touching the clock area that has the on-off boxes for Network, Bluetooth, WiFi, etc. I wish that I could have it only offer "Settings" and nothing else. Settings are password protected so they couldn't go in and turn WiFi back on. I wonder if this is something that someone here can guide me through?