I would "like" to think this would be a good move for both parties, but time will tell. They largely operate in two very different categories of audio.
Bose has been more recently focused on personal audio, automotive, home theater, and pro audio.
McIntosh Group has held steady with its brand and growth (if anything has improved upon it), while remaining largely in the premium audio space.
I can see Bose wanting to purchase McIntosh Group in order to extend its brand efforts and also its portfolio offerings. I would like to think the positive direction the McIntosh Group has achieved with its brand efforts would be very valuable to Bose.
On a larger scale, I think this is a move with consideration on how Harman has continued its growth trajectory and acquisition of recent brands, including Roon.