I'd still much rather spread the use out over 3 devices than 1. No matter how you cut it, all things being equal, if you spread the use out over 3 devices the three will last longer than the one that is being used for everything. there is less stress (on/off, heat, movement, etc) on all the devices when you spread the love. You will still get the same amount of total hours of entertainment from the three as the one, but over a much longer period of time. This really is simple logic. Time doesn't kill the device, use does. the more you use it the faster it will degrade and eventually break unless it is properly maintained and cared for (think oil in a car, or cleaning the dust out of your computer).