I come away from these recordings with the impression that Sinding was a highly skilled composer in the late-romantic style, although not one who had an extremely distinctive voice. I didn't find any earth-shattering revelations in this music, however it was loaded with memorable melodies, rich harmony and brilliant orchestration.
Of the two works, the first symphony is the more serious and ambitions. It is a dark, minor key work where there is a lot of emphasis on form and the symphonic process. The second is a more sunny work, where Sinding seems to freely absorb the styles of Wagner, Grieg, and perhaps Smetana (the sweeping orchestral climaxes of the first movement bring to mind similar passages in Smetana's Die Moldau). I also really enjoyed the adventurous use of orchestra, particularly the low brass. This music left me with a broad smile on the face.
The sound is what I have come to expect from cpo, clear, rich and detailed. The performances are very good.