Played our second session of Dungeon Crawl Classics last night. Early reports are positive.
I'm not, as a rule, a GM's Screen user. We play in a living room, I use my computer desk as my "GM's Throne" -- anything I usually need in normally at my fingertips.
DCC is a "charts" game. Critical charts (not as many as Rolemaster, to be sure) and Fumble charts, and every spell has it's own chart.
The *free* Crawler's Companion app is fantastic, but it rolls the dice for you, and my players and I all like the physical experience of dice. So for the next session it looks like I'm printing out a screen. I could cobble one together, but I'm pretty sure I have one in pdf format from the Fallen Empires Kickstarter I backed.