Iris fragrances bore me and much of the iris used now is cheap and somewhat screechy. I use them mainly to spray the sheets and various other fabrics. Iris smells great on clothes.
Iris Silver Mist is excellent. Bois d'Iris (Different Co.) isn't bad, uses quality ingredients, but turns into a pale woody soon enough. Bois Farine smells great initially but has little to offer beyond that. I don't think of it as iris anyway. More of a heliotrope smell. It's been awhile sense I smelled it. I used to like it but Hiris just fell away. I don't even remember it. My girlfriend likes it a little but it never makes an impression me. The Prada is horrible. A good example of the cheap iris being used these days.
You should also try 28 La Pausa (Chanel), No. 18 (Chanel), L'Homme de Coeur (Divine), Iris Pallida (L'Artisan), Iris de Nuit (Heeley), and Heure Exquise (Annick Goutal).