I'm not really sure if your main interest is the flip front feature or the sun visor. We've now been using sun visors on different style helmets for the last 3 years and I think they are absolutely brilliant. Just to be able to flick down the sun visor when you turn into the sun or flick it out the way if you move into the shade or into a tunnel is worth a lot. We've tried the Caberg open face, Nolan open face, Nolan flip front and Caberg full face. All with flip sun visors either outside or inside the main visor.
For me the main attraction initially is that because I had to wear glasses to ride, using sun glasses wasn't an option. Now I'm wearing contact lenses I may feel sun glasses are OK this summer, but the convenience of being able to flick a sun screen into your vision on demand is definitely a worthwhile safety aspect.
All the above helmets we've found comfortable although I think we both prefer the open face options. There's no doubt the full face provides the best protection from wind noise, bad weather and presumably accident damage. But I find the open face gives better all round vision, is lighter, more comfortable and not as claustrophobic.
Vanessa is using a Nolan flip front during the winter and finds it heavier than she would like. I'm using a Caberg full face and I wish I'd paid the extra for the flip front, but I guess that's because I've always been used to open face helmets.

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