It's a neat if fairly basic app. However it seems to have a huge and showstopping flaw. It appears to make no differentiation between traffic going out onto the internet and traffic on your local LAN.

Transferring a file to another Mac? That'll go against your limit.
Doing a Time Capsule backup? That'll go against your limit.
Streaming media to a PS3/360 or syncing an AppleTV? That'll go against your limit..

I could go on with examples but you get the idea. It's an app that's been coded well but the fundamental design seems flawed. Until it can differentiate between traffic on your local LAN vs internet traffic (maybe by using the subnet mask?) it's actually only useful if the only two devices connected together in your house are your mac and your modem/router.

If a future version is smart enough to make this distinction it'll be worth paying for. As it is, no.


Jon