In my 2017 Murano Platinum, the Bose is great, it all boils down to the bps on the digital audio going to it. In many posts here several people said 320kbps is best and I concur. I ripped the same song numerous times 96kbps, 128kbps, 256kbps and 320kbps and put them on a USB, and there IS a noticeable difference in the Murano and the 320kbps wins hands down. AM/FM well they are what they are, reasonable at best for car audio.
The sound quality of Sirius and XM signals via their satellites (or terrestrial repeaters) is, basically, terrible. The reason is bitrate. The two satellites use different systems, but both have around 4MHz of bandwidth to share amongst ALL the channels broadcast. This means that each music channel winds up getting enough bandwidth to transmit around 48 - 64kb/second of data = way better than FM but not even close to USB MP3 files. In other words, the encoding scheme is a modified AAC algorithm somewhat better than MP3, so this can get you about the sonic equivalent of a 96k MP3 = not impressive.
Using the 320kbps rip, the BOSE 11 speaker system performs very well in all regards, it's no earth shaking Rockford Fosgate gear but impressive nonetheless.
One significant improvement I made that was awesome is, I opened the subwoofer plastic thing on the spare tire, disconnected the 4 wires on the 2 subs and made the mono bridge connection to an external 10" JBL 2 ohm sub in a ported box in the cargo area, and wholly F_ing crap, now the rearview mirror is a vibrating, not like with the Rockford Fosgate mind vibrating, hair drying pounding but way way way better than those 2 little Bose subs, CON is that sub box occupies space in the cargo area, and I can live with that for the pounding bass I got out of that small easy mod.
Anyway, I just wanted to share what I found out in case anyone wants to do the same.