My C3 had one hot spot but is good now and love the helmet after almost 3500 miles. I did have issues with the constant fogging of the sun shade. I had to clean it every two or three days. I sent Schuberth an email and they gave me the option of replacing the shade with a like shade or with a shade with no anti-fog coating. I chose the shade with no coating and have had no problems for three weeks.
I also read on one of the forums that they have developed a new ratched system for the visor. I asked for it because the visor will no longer stay up. I received it in three days and plan on installing it this weekend.
The helmet might be quiet but I always ride with foam plugs. I already have tooo much hearing loss from serving on a Navy carrier for 2.5 years and 35 years of a fireman (those sirens can make your eyes water).
Schuberth customer reps are the best of ANY company I have every dealt with and that says a lot for my 62 years.