[Oz Cello]

If you bought it through Android Play store then you can use it on the Max 3 without having to buy it again (just enable the Play store on the Max 3 then install MSP) as long as you use the same Google account. You don't even need to uninstall it from your old tablet (but you totally should if you're selling it). It won't work as well on the Max 3 because the Android version is optimised for colour devices. If it's within your budget then it's worth buying the e-Ink version because it will work better and will support further development of MSP. I'm loving the Max 3. Hope it works out for you too