I believe that I am about through purchasing arrangers. At least until the treatment of voices and styles is a little less predictable and the units are less costly. In fact at home I am about to link my good old Yamaha 9000 via MIDI to my computer -- and when I want to really work out, I will practice some more challenging things via BIAB and some of the new KB sounds I am playing with. I just played with George Shearing's quintet in a circa 1960 thing that I converted to BIAB from MP3 files. Muted tracks, played with rhythm, etc. etc. Terrific practice.
Using my new ArtVista "Grand" voices -- love it.