>> a handheld music jukebox that can also make phone calls
It's only handheld if you ditch the connection to your old hifi, and then you're probably stuck using earphones. Plus, if you're actually paying for telephone service, you're liable to being interrupted without warning by scammers and telemarketers using auto-diallers -- by some estimates, 80% of all telephone calls in the US are junk or attempts at ID theft. If you don't pay for 'phone service, you might as well just get a portable music player.
What follows should prove that I am not inclined toward a career in marketing.
The Brennan devices are aimed at something else, e.g. a truly self-contained ripping/playback system (amp & loudpeakers included). It seems to be primarily designed for people who listen to randomized playlists and who only occasionally feel the need to find out exactly what is playing at that moment. Because of the somewhat minimalist off-the-shelf hardware employed, it is not as easy as one might wish to make it into "all things to all people". Because the software is not open-sourced, dropping in alternate features, controls, or appearances would have to be done -- and then supported -- entirely by the company, which probably means Martin.
There are other devices on the market, some of which might do more of what you like. Either they are priced substantially higher, or they require considerably more investment of your own time and technical skills. An almost certain path to disappointment is the desire to have one device that is suitable for every purpose (not to mention for everyone). Portable playback, background music for parties, and serious listening are three different needs; at least two, and probably three, different control interfaces and/or devices could be better suited to purpose. If you want only one copy of your entire music library, put it on the network so every device can share it -- but you'll still have to copy (subsets of it?) to carry it with you.
The B2 and BB1 do quite well what they are intended to do. They do not do well what they aren't intended to do at all. I firmly believe that the major failing in this regard is that the pre-sales documents -- brochures, web pages, adverts, enthusiastic descriptions -- are insufficient, and do not clearly and fully describe the intent and limitations of the products. Doing so would reduce sales volume, of course, and probably increase the *average* satisfaction of the remaining buyers, because people looking for something else wouldn't try to shoehorn the Brennan products into their particular desires. A specialist hifi shop is supposed to allow users to find out such information in person before buying -- but no one wants to pay for expertise and shopfronts anymore, so it's more important than ever that internet descriptions be accurate and complete.
Perhaps Martin should hire a tech writer with an engineering background to write such materials.
I'm sorry that you no longer love your B2, but happy that you have found out more about the kind of thing you would prefer.
-- m.