JOperation to bass trombone since September 2002. It has good bass and is just in lensemble trs. Equipped with two classic barrel mount SERIES (It can be activated either the first or the 2nd or both at the same time). Jai else test bass trombone (courteous and Yamaha among others) and here is my conclusion: The BACH is the best. In fact the slide is trs enjoyable, it is filled rle perfectly, there is less friction than on a courtesy. In addition linstrument sound is richer and finer than that of Courtois and Yamaha. The main default of this model are not quip quil nest of Systm Hagmann (there are in the range offered by the BACH Systm Hagmann), the pavilion is a little I got a small (about 21cm). It shall not be more CHRE that competitors making it dun good report quality price.
If I had to buy a nine men I re-take a Bach but with a larger house and the system Hagmann.