Thanks again guys. I found a picture of the Aquabox on a KLR650, which is the bike I ride.
As you can see the thing is pretty big.
Another thing that occurs to me is the the legality of using a phone on a bike. I'll probably only use it to monitor Google Maps or any calls coming my way, but I don't really feel the need to advertise to Johnny Law that I have a phone on the bike.
Thinkin that I am gonna cheap out & try the Arkon mount for almost 1/3rd of the cost. I found lots of good reviews of it online. And it seems like it'll be substantially smaller & easier to hide on the bike.