Let us know what you think of the N90, i have looked at them a few times and it seems like a decent helmet.
Very impressed with the N90 so far. Ventilation is a LOT better across the top compared to the HJC I had been running. The HJC had good chin ventilation, but the top was poor. The Nolan gets a lot more airflow, and is far cooler in the hot Texas summer.

Fit on the helmet is excellent, and while it snug, its comfortable. I actually put the helmet on and wore it around the house when it showed up, just to looked for pressure points and squeeze. I had no issues whatsoever.
The noise is SUBSTANTIALLY better than the HJC. Despite both having intergrated sun shades, the Nolans system is side mounted with a much small button. Still no issues moving the slider with gloves, but no rattle like I have with the HJC. The Nolan has an airdam that mounts under the chin that cuts down the wind noise from under the chin. Very quiet helmet in comparison to the HJC or even my buddies Shoei.
Tab on the faceshield is centered, so you can operate it with either hand, as opposed to left mount only on my HJC. The Nolan has about the same weight as the HJC, but its smaller in profile, and doenst feel heavy at all.
Most importantly for me, the Nolan has a pretty good rating from SHARP, and most importantly the chin bar stayed locked through 100% of the impact tests. There were only a couple of helmets that met that number, and the Cabergs aren't available in the US.