Gotta agree with the other posters here. It's worth having. It's not perfect, but it is very very good. The notifications and limited ability to respond to things are truly all I currently need out of a wearable.
The important aspect when it comes to deciding whether to get a Band is the cost.
The Apple Watch is getting a lot of mixed reviews but the general theme is that its an Ok device, but not great, however it's going to cost you a lot of money to figure that out.
The Band is a cool device, but its far from perfect. For me, I don't care what it looks like or if it gets scratched and knocked up. I'm using it on a purely practical basis. I want it to build as complete a picture of my health as possible, and that means I have to wear it a lot and it's gonna get banged up a bit.
But at ?160 most of us will be able to afford an upgrade quite regularly.
If, however, you go the Apple route and shell out ?400 or more there's no way you're going to want to replace it every time Apple improve on their still very experimental device.
That said, the ifans will still buy that thing by the millions