Like MOST MacUpdate users (I am sure), I am NOT the fan of the App Store...however, against my better judgement I tried clicking "Purchase" link and found:
Item Not Available
The item that you've requested is not currently available in the U.S. store.
...so, I'm back to I really DON'T know if I want to support this Mac Store ONLY software, but for the moment (at least), I don't even have an option TO support it if I wanted to.
To The Developer: Please do consider co-developing a NON-Mac Store Shareware option...IF you would be willing to actively do so, I'll be your FIRST customer in line! ;)
All the best,