Testing on a level 29 mercs/traps MM using only SO's. Going on +0/x0. Missions 1 and 2 were fairly easy, as you'd expect for a MM. Caltrops and poison gas ensure nothing really got to even touch me, not even the zoombies. Though I did get hit by 1 zoombie explosion, and it wasn't nearly as punishing as on live, where one explosion could kill half of my henchman. But it did seriously wound my henchman and I had to react quickly to every zoombie afterwards to prevent a wipe.
Mission 3: There is a bug, at least on this test. I'd have to replay it to find out if it is consistent. In the final room, where Raverobber is located, the entire concrete floored area makes my character stutter an insane amount. Not my henchman, not the mobs, but just my character. It is nearly unplayabled. Hovering slightly above ground, you will still stutter. So going about 5 feet off the ground was necessary for me to react, however as a /traps character this presented problems.
Raverobber himself was quite fun and challenging for me. He managed to kill my commando, all the T1s, and a T2 before I could down him. Luckily with the MM changes I was able to prevent a wipe by resummoning and equipping, while also not going completely empty on endurance and still capable of using other abilities to slow him down.
Have not gotten any further so far.