How do you roll?
Mainly real dice. I used a diceless app for WFRP3E as it was cheaper than buying the custom dice FFG sell for that game, but it wasn't the same. I also try to use the latest in dice technology and recommend The Dice Shop. Why risk repetitive strain injury by rolling 2 dice when you can roll one inside the other?.
That said, I roll badly. All the time. Seriously... and we're not just talking about my aim.
DM: "The target number is only 7 on a d20."
Me: "Yeah, I'm not going to make that."
*rolls a 4*
DM, realising this is the 4th time in an hour: "Yeah, you are unlucky."
That said, when I DM I roll very, very well. As in rolls I wish I could summon as a player. This is because (and do not let this get out) I want the PCs to win, or at least be in decent enough shape to progress with the scenario. So naturally every roll is a natural 20 or whatever its equivalent is in the system we're playing.