I have a Nolan N-102 and I really like it.
I considered an HJC modular but didn't like the release mechanism on the one I looked at which was a simple push-button on the chin. I felt that it could release the flip-up chin guard too easily with an impact. I also felt that the actual locking mechanism looked a little weak, and overall, the flip-up portion felt too flimsy to me.
The Nolan has a two stage button mechanism requiring a simultaneous pull (to reveal the second button) and squeeze (of the lever and the second button) which seems to me unlikely to be accidentally triggered. Also the actual locking mechanism appears to be very robust. Once closed, the helmet feels very secure. I have noticed though that simply closing the flip-up emits a convincing locking sound, but one of the sides might not be properly engaged. I always compress both sides manually and then try to force the flip open, just to make sure that the locking mechanism is well-engaged. Even with heavy gloves on, opening the flip is quick and effortless.
Comfort-wise, I am very pleased. No pressure points or irritating areas. Fits my roundish head very well.
Sound-wise, I rarely travel over 70 km/h so it's not really an issue for me, and I don't wear ear-plugs. I find the sharp snapping noise of the flip-up locking down very loud and I worry whether that's too much for my hearing to bear. So now I now longer slam the lid down in a cavalier way like the Black Night. I close the flip gently and compress the locks firmly by compressing the chin guard to the helmet until they latch securely.
The ventilation is less than ideal. There doesn't seem to be much change in the airflow whether the vents are open or closed. Lifting the visor to one of the detents provides ample ventilation though. The only time that's a problem is like yesterday evening when it was either raining hard, or if not, there were clouds of shad flies, so the only comfortable option was to leave the visor fully shut, and then trying to control fogging.
I really like the ratcheting chin strap closure. It's very fast both to secure and to open, and even to adjust if it feels too loose or too tight, even with gloves on. The only issue with that set up is that the helmet locking hook under the LX seat is of no use since there is no D-ring. I solved that problem but using a short helmet cable lock which I thread through the visor and around the open seat. The cable is just the right length to hold the helmet close to the bike without binding. Lowering the seat pretty much puts the helmet where it would be if it had a D-ring and were hanging from the helmet hook. Never use the purse hook to hold the helmet since lifting the seat ejects the helmet. I did that once too often and it cost me a new visor ($60).
The liner is removable for cleaning which is a plus. I haven't done that yet, I'm guessing it will become end-of-season maintenance.
The helmet is designed to accept the Nolan N-Com bluetooth communications system, but I haven't sprung for that expense, so I can't comment on it.
There is no internal sun-shade which was added to the N-103. It's a feature I would love to have, but it would have cost about $200 more for the new model, so...
If I were in the market for a new helmet, I would still shop around to see if one of the other modulars suited my needs better.
I really do love my helmet though and definitely have no buyer's remorse.
I paid $260 tax in on sale from the BMW / Harley dealer. I got a good price since the N-103 had arrived and this was their last N-102.
Be sure to post your impressions of whichever helmet you end up going with.
Good luck with the purchase.