Overall Rating: B

PROS: Great end of map rewards and pets, build was super stable/reliable, best quality drops and lots of mechs

CONS: Most waves had less than 1K mobs, so the overall numbers are pretty low. 

With the extra DU, you can make your buff beam one unit longer.

We did manage a Ult++ drop, but it wasn't great.  

Party: 1 Tower Boost Monk, 1 DPS (I used Gunwitch), 2 summoners with guardian pets (Huntress/Monk)

I added the minions in at about wave 27, and they managed to distract the mechs and keep them off the crystals.

Hint 4: I posted my gunwitch at this spot and blasted the spawn, which helped move the waves along and take some burden off the build.