on christmas day (well night) i drank just about an entire Grolsch mini keg, i picked it up for a mate from the bottle-o, and we busted him open just after midnight or so, and knocked it back pretty quick. Tasted great (although i was insanely drunk already)
Also on those problems, here how i think you (well me actually, as i am considering these) could avoid them.
1 the tap doesn't seal well - if you purhased the first mini keg setup, it use a picnic tap. This is what i use with my portable keg system (miracle box, small gas bottle and soon 3gal keg) and they actually seal very well. So it might be the other ones that dont seal.
2 The CO2 cartridge leaks; I must use a new cartridge if kept more
than a day or so. - This one is the easiest for me, as i would never leave on for over a day, they would only last max of 3 hours or so. That means this will not be an issue.
3 - It is extremely easy to overcarbonate the cans - I dont see how it wouold be so much different from bottles, maybe this guy had carbonation issues with bottles too, who knows. But if i was using one, i would fill from my keg system, so again not a huge issue for me in regards to carbonation.
So im still considering getting a setup like this, just because its small, you can sit it in some ice, and would normally be gone in a few hours. Just seems easier then carrying 2 dozen stubbies to a party.
Oh well, thats my 2cents.
Also doc, great site their, they have some great stuff. Love all the bottles they have to choose from.