@itrader - We passed 100 users a couple of weeks back, and have now had enough time to make smartphone specific improvements to the GUI. Android devices are quite varied, so it takes some work to verify that advanced software actually works on all devices.
I can report that according to the Google stats, the Nexus 1 is one of our top installed Android devices, and no one has complained that it doesn't work on this phone.
Devices which have so far been positively identified as working are: the Samsung Galaxy Tab, the HTC Desire, the Motorola Atrix, the Motorola Droid Incredible, the Dell Streak, the Adventa Vega (only just, as it restricts memory available to apps, so it may need more memory optimisation), the Nexus S (with a remaining bug in the more advanced timeline mode), a keyboard HTC (it recognises the keyboard successfully) - and of course desktop computers running Java.
One of the users with an HTC myTouch 4G (with a relatively small 3.5" screen) said it would be better on a bigger screen - but storyboard mode has big icons, so this should still be quite usable.
Top devices with our software installed are currently (in order): HTC Evo 4G, Motorola Droid X, Samsung Galaxy Tab, Samsung Galaxy S, HTC Desire, Motorola Droid, HTC Droid Incredible, HTC myTouch 4G, Motorola Atrix, HTC Nexus One, Samsung Galaxy Tab (alternative model).
I hope this helps.