Maybe I'm going insane and what's on my monitor is not what I'm reading inside my head, but I just spend a few minutes going through their compatibility checker and they don't list a single phone that it's compatible with. Just a whole bunch of unsupported phones.
I think the idea is that if your operating system is listed as supported, and your specific device isn't mentioned as specifically unsupported, you just hope for the best.
If you go digging through the support forums, they do actually have a more detailed list of devices supported. It's just the front page that most potential customers will see first that's badly designed, and as we all know, if a customer doesn't find out what she's looking for quickly, she will always go on to devote extra time and resources to digging through support pages.
I just looked up all the smartphones in both my family and my girlfriend's family, and they're all compatible (BlackBerry 5 (9650), iPhone 3GS & 4 (iOS 4 for both), and Android 2.1 (Ally, Droid, Droid Incredible).
http://wakemate.com/compatibility/