If you ask me Montana smells the worst, Then Ironlak, then Sabotaz. The newer cans don't smell as bad as the older stuff from Sab. Ironlak is really runny in my opinion and it clogs black dots like there's no tomorrow.
I also have a shipment of Ironlak coming within the next two weeks as well. I'm direct with Ironlak.
I will admit that though, Hardware store paint doesn't smell AS bad as these so called designer paints.