Internet, you're welcome (I got hundreds of requests for this review since the instrument was announced 3 weeks ago!)
Here is the brand new Backun Alpha Low C Bass Clarinet (he's making an Eb, too), and my review of the instrument.
0:00 Intro
1:29 How is it similar to the Model Q?
2:00 First listen
2:31 Guided tour
2:36 Triple register mechanism
3:58 Articulated C#/G#
4:53 Accessory attachment
5:37 Low fingering system
6:54 Standing peg
7:10 Case
7:28 Blind listening tests
11:05 Kessler vs Max vs Alpha - my opinion
13:00 Summary