Delivered today. They look like pretty good quality. I don't feel like having my hands possibly smelling like gasoline as I cook Christmas Eve dinner, so I'll play with them later this weekend. I have 1 "new" style Jerry can (no vent), and I had modified my previous cans to block the vent too. I did that because the "new" style funnel was the only option I had, and it wasn't compatible with the old cans' vent (leaked even worse). Looks like I'll need to add schraeder valves to all of them for better venting now.
I also have two of the "no spill" cans, and they work pretty well. Well, except for the "auto stop". It never seems to work right with my lawn mower and overflows, so I've stopped trying to use that feature.
ETA: while I ordered the "black tube" version based on the picture, I actually got the white tube. No big deal, maybe the white will be better for watching the fuel flow....