Ok this is almost nothing like the anonobox. First off Project Sierra isn't just hardware it is a subscription service that you must subscribe too! Not true for the anonobox. PSierra runs android while abox ran Tor, which would you trust more? (I do not trust in android security).
I still don't understand what was wrong with Anonobox not shipping with custom made hardware? I also don't care about updates as long as the feature set the device ships with works. PSierra isn't the solution most people are looking for.