It does work well with the XDAII... However, there is some incompatibility with some applications (i.e. SBP Pocket Plus and Pocket Weather) that causes the pad to stop functioning and sometimes a soft-reset will fix it for awhile but sometimes not even a soft-reset fixes things.
I'm still trying to figure out which other apps do not work with Intellipad (Phonepad).
So, your best bet will be to try it without any third party apps installed. Oh, by the way, this application was developed by HTC, the same guys who developed our beloved devices...
My Current Devices: Samsung Galaxy Note (International Version), Nokia Lumia 900, (backup), Motorola Atrix 4G (GB 2.3.4)*sold*, Motorola Lapdock *sold*, Asus Transformer Tablet, Nexus One Google Phone (retired), Viewsonic G Tablet (retired), Nokia N97 40 Gb *sold*, Nokia 5530 *gave it away*, HTC Touch*died*, HTC Touch Diamond GSM*sold*, Palm Pre GSM*sold*