Superb quality small Volume Phase Holographic Gratings are available and in operation at ESO. Compared to Surface Relief Transmission Gratings, they have better efficiencies at high dispersion. Their role at ESO would/will expand with larger sizes, high index modulation (larger bandwidth; access to the near-IR domain), cooled operation (also for the near-IR) and the articulated spectrograph approach (higher dispersion & efficiency than with Grisms).