I am among the few that think the 901 is a very good speaker for the right room and electronics. My introduction to King Crimson was Lark's Tongues in Aspic through a very good setup cranked up very loud. I was completely unaware what lay in store for the first track.
With sufficient room and with proper walls and spacing, they are still excellent for medium to loud volumes. For moderate to low volume listening, I prefer other speakers.
Bose made some excellent, groundbreaking designs. Other manufacturers since caught on and have been re-defining what we consider good designs, but Bose deserves its spot in the pantheon of engineering excellence.
