I bought an N44 1 year ago. It has good air flow for summer and seals well down into the teens. The sunvisor could be lower, but most sun visors are high. the B5 bluetooth works well, although at speeds over 75mph, it is hard to hear. I use the helmet without the chin bar in town and add it when on the highway. With a little practice, you can add the chin bar after the helmet is on. Best helmet for the money I have bought in over 20 years of riding.
I bought this because the design of the Nolan N90 helmet causes the plug in to be bent on your shoulder of your jacket. I paid over $50.00 with shipping and after plugging it in you can not hardly hear the stereo. I then plug in the original cord and it worked fine. The quality control is terrible on this product. No wonder Nolan changed the style of plug on the new helmets.
This is the first modular I've owned, replacing a Shoei RF1000. I'm impressed. The Nolan is a quality product, and even with all the extra parts is lighter than my Shoei and has a comparably huge visor for much better visibility. I haven't ridden much with it yet but I have a few comments. Wind noise is acceptable unless you turn your head or strong wind is coming from the side. Then it's unbearable, and the roar can come as a distracting surprise. The sun visor is great but does not come down far enough so there is glare from underneath. The fit is very tight around my ears and while I haven't tried it with ear plugs yet, I expect it to be difficult to keep ear plugs in place when taking the helmet on or off. Sunglasses do not seem to fit. At slower speeds with the front lifted there is no noticeable change in noise or buffeting. That's a great feature. My biggest gripe though is the quick-release chin strap. It ratchets so it can't be finely adjusted, and with no D-rings, I can't use my bike's helmet lock anymore.
I have had nothing but problems with this product. The firmware is extremely tricky to install. The software does not work properly and the charging fails constantly. Add this to limited 10 hours of battery life I would not buy another Nolan product. To cap it off when I tried to update the firmware which is a nightmare, the instructional video is only in Italian....