My experience with Etro is limited to Sandalo, Via Verri (rose), Mahogany, Patchouli, Anice and samples of Messe and Vetiver.
Considering the retail price of roughly 80 (90 for Via Verri), which puts this in the Villoresi price range, I must say, that, while they are not bad, there is usually a superior alternative. These are mostly rather simple constructions intended for personal blending and from that premise I would expect a more serious attempt at smelling natural - many Etros, however, have a synthetic note which can be as irritating as a weld seam on an otherwise smooth surface.
Floris Sandalwood or Villoresi are both infinitely superior to Etro Sandalo IMHO, which is also too weak.
Mahogany, loved by others, is a symnthetic wood nightmare for me
Vetiver pales in comparison to Villoresi
Patchouli is a good one, and so is Via Verri - though here I would also prefer Parfum Sacré, C&S 88, Voleur, or Maréchale
The really original one is Messe de Minuit - though you should test wether you enjoy smelling like the ancient library from The Name of the Rose before buying a whole bottle.
For myself I have decided that other houses are more along my line & I won't be buying anymore ETROs except if I can get them for a song (ladeeda