There is another thread running on the Justissimo.
I have just ordered on, so will be able to give some feedback soon.
Opinion seems divided - some say fantastic, some say rubbish.
From what I can sift out, some visors leak water in from the top, some find them noisy, some say that they are not up to the Arai/Shoei standard and that the lining material is 'rough'. Others say 'best flip front' helmet. All 'flip front' helmets weigh more than conventional helmets.
They seem to be marketed by FM Helmets - I had an FM Helmet years back and it was fine, not up to Arai/Shoei standards, put not the same price!
I too am going for one because of the internal sun visor.