If you have purchased it for your other Android tablet, you can copy the apk over and give it a try.
The Nexus 7 is not officially supported neither, but I can run it fine -- the UI is too small for a 7" tablet, though. FYI, I ran a virtual image of ICS on VirtualBox and made it pretend to be a Galaxy Tab so that I could purchase the app from Google Play. And, no, before I paid, I had no idea that it would run on my Nexus 7, so I was taking a $9.99 risk.
Europe, Middle East and Africa