I play a Streb emelodeon as well. As such it can play in D/G (or any key for that matter) or B/C or C/C#. Also the keyboard layout can be be altered to start on 3 or 4 with low notes or accidentals. As such it meets all the needs. Of course if you mainly play tunes in D or G most of these useful features will remain unused. But if, like me, you want something that can sound like a concertina in E or a cajun box in A (for song accompaniment) it's ideal.