While basically every ARMv7/Cortex device should work with Unity, and it makes little sense to keep track on all the hundreds of Androids that are good for Unity, sometimes something happens that makes some devices go wrong.
So basically this thread is to keep the community aware of devices that should be compatible but are not. So if you get bad reviews on certain devices, please keep us posted.
- Samsung Galaxy S - OS 2.1 had some kernel issues. With OS 2.2 and newer should be good for Unity.
- HTC Sensation (Pyramid) - OS 2.3.4 introduced GPU issues. The fix should go into a firmware update that is promised for October
So if a certain device appears incompatible with your game, please escalate the issue in this thread. For the given moment we're aware only of these few devices that have a certain buggy OS versions.