The sound signature favors accuracy more over boosted frequencies. The highs are detailed yet are not too bright or harsh. The mids have good presence and never gets in your face and the bass delivers good punch while staying controlled.
While the accuracy from these is great for studio use, some may perceive this as boring. You may need a different pair of headphones after your studio monitoring/mixing sessions using the SRH1540, if a fun sound is what you are after.
Treble is quite detailed, but lacks a bit of sparkle on the highest frequencies as they are rolled off. The mids are just right, not too forward and not too rich. The bass has good presence and punch, but is not very powerful.
While the leather surfaces feel soft and smooth on the skin, they also trap heat very well. You may feel the warmth building up quickly around the ears and on the head. This can also be an issue if you sweat a lot.