I have one and I love it. It gives you scrambles for 3x3x3, 4x4x4, and 5x5x5, gives you inspection time, and keeps track of what you're averaging. It can store up to 250 solves. It's completely perfect for long trips. They are definitely expensive, but I have gotten a ton of use out of mine and am very satisfied with it.
By the way, the timer is actually light sensitive.