As for vertical welds, you ever looked closely at Blichmann's stuff? I mean doing one piece extruding is very limited as to what you can build and almost can never be taller than it is wide... So all the Blichmann brew kettles for instance, those are welded up the side and i don't see anybody having problems with those.

And speaking of Blichmann they are using 0.8mm stainless on a bunch of their products. About as thin as you can get away with to be honest. But again, nobody ever accuses them of being cheesy. Just that name alone gives them 2x power in pricing versus reality of materials and cost i would guess.
As for 45 degrees versus 60 degrees in the conical base, let's just say gravity should do its job and the trub should gather very nicely down there. From the looks of things (and the fact that on their conical page they have a pic of their 7 gal conical being pressure tested in a brewery), these guys would at least on the surface seem to know what they are doing and probably aren't just making random stuff without some thought to what brewers will find of value and/or works, so i'll give benefit of doubt for now at least.
Still, it is a funky product without doubt. But glad to see someone doing something new / interesting anyway. Equipment world pretty boring lately to be honest. Nobody reaches, then we never get anywhere other than where we have been

)
On the list to get notified when they get some in stock and be curious to see once some guys do some real reviews and write ups.