I worked on my Darius + Blitz combo, and holy crap we are really getting that down tight.
We both start off with double grab/reach just so they can't escape once we start attack. It got us first kill in under 40 seconds , second kill in the next minute.
We really destroyed this game, fell off mid-late game, but I came back once we hit about 30 minutes in. Amazing game imo, probably could have built him better though.