I have an old Extron BUC 102 and it is a great-sounding “DI box” for it’s use. This is the newer model that replaced it, the BUC 202. It has the same functions at the older BUC 101, which is to convert unbalanced audio to balanced audio and vice versa. The only difference is that this model has a built-in power supply whereas the older one needed an external Extron power supply. I suppose the only thing I like about these boxes are it’s versatility in converting balanced to unbalanced and vice versa. For all other uses, an inexpensive, passive DI box will do the job just as well.