I've been using the RF1000 for a couple of years. I give it a "B" overall. It is very comfortable and is wearing well and the ventilation is the best of any helmet I've ever owned. I liked my RF800 a little better mostly because it was quieter (but didn't vent as well) and the lower edges were, well, lower than they are on the RF1000. To earn an "A" I'd look for a little less noise, better accommodations for ear speakers, and a lower skirt if you will, to make it feel like my head is further inside the helmet. This latter thing is probably just a personal "security blanket" mental thing.
You just can't beat the quick change shield design that Shoei uses on all their helmets, I can do it whilst wearing the helmet. Very handy at the side of the road when you need to make a quick change.