Booked one of these 1-2 months ago - great deal for a very decent product. Already worth it for me just for the miles and the XP to put me over the top to platinum with FB.
It's indeed an offer that comes and goes. You will also find often availability from MXP (with some interesting routings through MED instead of RUH or JED which is more customary). Just not sure how great that would be in the middle of Hajj season to the end of August...
And for the users which are surely to follow with posts complaining it's a dry airline: just booze up on Prosecco in the Alitalia lounge and sleep the rest of the way!