Following the interesting thread about the Greenbacks here (I can't participate in) I thought this video could be of some use for those seeking differences among cones.
The same test is run here live (4 videos). Lot of (Italian) talks, I've cut the first one down for you.
No trying to sell anything here of course 
It's just the brand of cabs I happen to own 
On this page some further information is available for technical specifications about the cones. It's in Italian, but the technical data are quite obvious 