I've got three 5gal cans made by 'Blitz,' two of which have the vent-in-the-nozzle deal.. The other was sitting in the barn when I bought the place, and had about 1/4" of fuel varnish in the bottom.
The two new ones don't pour worth a nickel, but the old one has a vent and pours great. Since it was crudded up, though, I just use it to haul water when I'm setting posts in concrete. Less spillage than a 5gal bucket and you can get better control of the placement/volume of water for each post. I've found that I end up being able to set more posts in between re-fills by using a 5gal can versus a bucket.
BTW, I've also found that the two new 'Blitz' cans pour better when you turn the cap about 1/4 turn out from being tight. Seems like it can get more air that way. I usually turn them tight and point the nozzle straight up for transport, and then turn them out a little and point the nozzle down before I start pouring the fuel.