Yes, they are great...you notice he/they auditioned a pair of them.
I found
one Bose not very satisfactory...you need the pair to reproduce stereo pianos, effects like rotary speaker, cross delays etc.
I used a pair of the L1 Model I single bass systems for doing concerts...astonishing sound...high price...well worth it, in my opinion...
you only should have to buy a PA system once. The powered speakers (Yamaha MS60S) I use for restaurant gigs (and for home as well)
are over 20 years old, and work just as good as the day I bought them...the Bose, considering their high quality, should do the same.
Arrangers are another matter.

Ian