I tried it a few weeks ago and it went straight to the top of my wishlist. I bought a bottle from Selfridges Oxford St last weekend. I was persuaded into getting the boudoir atomiser attachement and do not regret it - spritzing yourself with this after a brisk shower and before putting on a white cotton shirt makes you feel like the Duke of Savoy!
I think it is more interesting, complex and longlasting than Aqua di Parma. The top notes are similar (lemon, bergamot, lavender) but somehow brighter than other colonias. The real beauty of AdGen is in the heart notes of neroli, rose and jasmin (similar to another favourite of mine Castile by Penhaligon's). Even though it is not underpinned by anything dark and heavy - some musk and a little patchouli - it carries itself as a clearly masculine floral.
It's been too cold to really appreciate it fully yet, but can't wait for a summer evening, clean-shaven, open-neck shirt, night-scented stock in the garden, a glass of Campari and ice and little cloud of Acqua di Genova hovering around me - bliss!