I can't comment on Classic AI since I have not tried TS on it yet. Not a feature I typically care for anyhow. However I do NOT have any rebooting issues with my unit, and there are 2 or 3 days a week that I have it turned on streaming in the background (when I work from home), for at least 10hrs a day. Using primarily 3 servers on it, 2 XC subs, and 1 is a custom M3U which I maintain with some public streams.
However I just enabled TS and tested it on my X5 SS, using BuzzTV 5 and it seems to work as expected.
Your B5 should work similarly, except that will be quite a bit slower in responding as it is the super basic/entry level device. Being a slower box, and only having USB2 ports (no USB3) it can be challenging. If the bitrate is too high, the USB2 port may not be fast enough to keep up if using USB storage.
First of all, it only works if you have "Primary" player selected for LiveTV in Menu->Settings->Configuration. If using "backup" it is not enabled.
I also found that it works better if you force the Stream type to "TS" instead of Automatic.
If you are using USB for anything (Downloading, recording or TS) then you better be using a very high quality USB device. And don't forget to enable the "FORCE USB TS and set set the TS cache storage location). Also ensure to format the unit as portable storage, or if you have access to a PC, format it using exFAT on your PC, before inserting into your BOX.
Also, I don't know what kind of sub you are using, but all my servers are XC type subs. I do not have any MAC based subs, and don't care to use any services that are only MAC based any more.
Other that that, it works fine. Attached is a quick snapshot of it in work a few minutes ago.
PS: When you also buy the latest device of ANY brand (not only buzz), you are being naive if you believe you will not be faced with a few bugs as it goes into use with a larger number of users. Even when you buy a flagship phone for thousands of dollars, it is often riddled with bugs and already piles of recorded bugs before it hits the shelves. There is always the early adopter advantages/disadvantages issues you need to deal with. If you are not ready to deal with that, then you should always stick with a long time proven older device.
There is nothing stopping you from installing any other software on your box that works for you, with all the features you want.