Size / Fit: Normally I am a small when it comes to helmet fit. I tried on both the small and medium sizes (same size outer shell on both) and found the medium to be more comfortable. The padding (which is fully washable and removable) does appear to hold its shape well, and is certainly far better than my old Nitro helmet. The helmet was immediately comfortable and having spent a constant 2 hours with it on I can report no uncomfortable pressure points.

Visor: The visor is reasonably thick and comes fitted with a clear pinlock insert. There are tabulators(small proud diamond shapes) on the upper rim of the visor that are supposed to reduce wind noise/whistle. A bit of a gimmick in my opinion. The visor seals well against the helmet and has a small lock that keeps it securely down, a nice feature. There are 6 positions between fully open and fully closed. Movement of the visor between these positions is positive. Getting the visor into the city position, which is just open and no more can be a little difficult with thick gloves on, but its possible with a little practice. The visor is easily removable without tools. The internal sun visor is dark enough (80% dark) and easily operated (even with thick gloves) via a lever on the lower left side of the helmet. Schuberth say that it is infinity adjustable, which it is, but I doubt that you would use it in any positions other than fully up or fully down. I felt that it would be nice if it could come a little lower however as the sun is generally upwards the it does what it is supposed to. There are small tabs on both the right and left hand sides of the lower edge of the visor to aid moving it up, some helmets only have them on one side, so that is nice to see. My local dealer thinks that the visor may be the same as the C3. If that is the case then getting a replacement should not be a problem.

Ventilation: This helmet is extremely well vented. There are several small holes that are permanently open on the chin vent, keeping a constant airflow moving over your face, distracting at first but I soon got use to it. The chin vent is simple to open, even with gloves on, and should stop any fogging (should you require it (pinlock not working? doubtful!). When you get up to 30mph or above you probably wont want this vent open, and its simple to close. The top vent is again easy to operate with gloves on, although requires a little more practice than the chin vent. It has 3 setting (fully open, half open and fully closed). There are 2 small flaps on the helmet lining that you can fold back which ensures a constant stream of cooling air right onto the top of your head. Not to your taste? Then just fold them out again (it takes seconds with the helmet off) for a less severe cooling experience. There are several extraction vents on the rear of the helmet that get rid of the air that has been circulated. Make no mistakes this is a very well ventilated helmet. I will be interested to see how it copes in a downpour, with it being constantly vented at the front. Winter / cold weather riding might be interesting ! (the addition of a thermal balaclava should sort this tested in the summer and there was a noticeable difference)

Chin strap: Micro buckle design, which is easy to fit, adjust and remove. It features Schuberths AROS fixing technology, meaning that the strap is also attached at the rear of the helmet. This is designed to be less likely to roll off in the event of an accident. Similar technology has been used on bicycle helmets for a number of years now and does appear more secure. It does not effect the fit of the helmet. The only small issue I have encountered occasionally with the strap is that it appears to be a little too far back and there is the occasional pressure on my windpipe from the strap. More fiddling required for a slightly better fit I think. Ensuring that the helmet is adjusted so that the micro-adjust buckle is all the way home does improve things.

Stability: Little to say other than I have had no issues at all and the helmet appeared stable at all (legal) speeds. No unwanted lift, even at speed. I was even pleasantly surprised when I moved my head left to right at speed (this used to flip open the visor on my Nitro not fun).

External noise: Schuberth do appear to pride themselves on their helmets ability to keep external noise to a minimum. I have a race can on my bike and its somewhat noisy The Schuberth does a good job of keeping this noise to a minimum (that said I will always ride with ear plugs in). The S2 does come with a removable wind deflector (re: chin curtain). Without this fitted I felt that there was too much wind noise. When the wind deflector is fitted there is a noticeable reduction in wind noise. Be careful with the wind deflector though, its can deform out of shape when fitting/removing the helmet (it attached to the inside of the front padding with Velcro)

Overall: Very happy with my purchase and a real improvement on my previous helmet. It is a great helmet to wear and is very comfortable as well as being packed with features. Only the slightly too far back chin strap and sun visor not coming down quite far enough stop this from being absolutely perfect, however I am really splitting hairs. Its also expensive. Each to their own though.