I was extremely happy they were using the Bachs. Before Edwards, Shires, ect, came out, those models (of course not silver) were the standard orchestral trombone. I believe Joseph Alessi himself played on one for a while.
As a trombone player, I would be very happy to be in the Blue Devils to be able to play on a quality instrument over the summer.
Nothing against Yamahas, or Jupiter trombones, ect. But they are very different horns. As an orchestral player, if I wasn't on an Edwards, I would be on a Bach 42BO.
+1 for BD on my count