In what ways? You don't need to carry around with you an extra power supply, and the Lide scanners themselves are extremely compact. I've owned an early Lide scanner for about 3 years, and its still working perfectly. (So that should give an idea of reliability.)
The only time you'd need an additional power source for the scanner would be when you are driving other devices off the USB ports, and can't supply any more power. The easiest workaround would be to buy a powered USB 2.0 hub and connect the scanner to that. Still works the same. (Although you then have that power pack problem - So I'd try and keep the amount of USB devices on a port to a minimum, and connect the scanner directly.)