I had a pretty similar experience with the Nike FuelBand I bought. I haven't had any hardware problems, but I couldn't get over the feeling of having a hard plastic wristband on all the time. The value just wasn't there to offset that. Now it just sits on the charger on my desk, not doing much of anything. These days I mostly just use the Moves app on my phone which gives me the number of steps I walked and total distance, which is all I really care about anyway. It'll take a really integrated/seamless experience to get me to try another band.
Assume the channel delivering the token is email. Then to login you provide your user ID or email, identifying who you are, they immediately email you a token (or link containing the token) to login with.
This doesn't feel like a Humble Bundle to me. I loved Humble for spotlighting great Indie games. If I want cheap older triple-A titles I'll buy them during a steam sale.
It is great that it's all going to charity, and as you said, kudos to Origin for that. I just don't like the direction Humble is going. I want them to be a place I can go to find interesting Indie games I might not have heard of before.
The best replacement I found was to host my own instance of Kolab 3[1] which was a pain to setup, but seems to work pretty well and looks nice. I couldn't find any good hosted solutions though.
One other thing I would add is to check on different variations of Android (stock, HTC's Sense, Samsung's TouchWiz, etc..) as well as resolutions, since they have different default widget styles and colors that can affect your app in different ways. (Android 4 is much better about this with Holo, but anything before it can vary a lot.)
If you stick with native styles for device elements (such as the action bar & notifications) that should cover 99% of requirements.
Widgets are a different matter. Suffice to say the big difference there is between Samsung/HTC who displays full-sized widgets and Nexus/Motorola/Asus who force widgets to use way too much padding.
You rock. This is crazy useful for trying out styles on stuff i'm building. I'd echo one of the suggestions here, there needs to be a way to apply to non-body elements.
I wonder what other data the seller has. It seems likely that you could get more valuable data from the users of these facebook apps since people tend to says yes when apps ask for permission to access data.
From there you can at least deactivate your account, not sure what other pages are also accessible without going through the modal.