I don't know how the AR-108 will work in the long run, since I've only had mine since December.
Anyway, for my needs it's a great scanner that you can carry with you every where. I don't know how it works in competition, but I love it. If you're just going to listen to the communications, and don't have so high ambitions on it, it's a great choice.
Just like birdwatching - without having to be so damned quiet!