I bought the 75 just after it was launched and yes, the BT connectivity was terrible. I lost patience waiting for a solution and so I sold it. I recently took a punt on a used 30 for a good price and updated the firmware. I am pleased to say Line 6 have finally sorted this out. I'm an Android user if that matters.
My 6 year old Android tablet running ICS isn't supported but works fine.
From that I conclude that "supported" doesn't actually mean much as to whether it will work or not, so I'll wager a bag of toffee that the CB will work just fine. :)
The top 10 suggestions were made over a year ago and there hasn't been any action or feedback. I'm sorry to say that I have no confidence that they are being considered seriously.
I put 4 instrument cables and two 9v lines in sheathing for my Firehawk that worked well, a bit bulky though. So I bought a used Horsa 8 way, cut it down to 4m and converted it to a 4 way plus two 9v lines. I'm happy with that.
If it helps, I had the AmpliFi 75 and experienced problems with the Bluetooth dropping and refusing to connect. I've had no such issues with the Firehawk in over a year. Same Android phone, tablet and apps.
A happy bunny here too. Yep it can be improved upon but I'm fine with it as it is.
I will say that I won't be as quick to jump in again as I did with the Firehawk and Amplifi. Both needed a couple of updates to get them working correctly. As for future Firehawk updates, I would assume Line 6 have their hands full prioritising all those bugs in the Helix list.
Out of the box mine was ridiculously difficult to operate so I carefully filed down the rubber bump stops by a couple of millimetres. The switching works perfect now with just the right amount of effort.