So from a difficulty standpoint,
- You have to be on the ball and press sneak really quickly
- Sneak does not always work, which means occasionally rogues get to die (5%?) and monks will have to FD about 1/3 of the time
- Sneak aggro radius should not be zero, so occasionally you should get more than 1 if the mobs are close. If you have a huge train, you should definitely get more than one.
That sounds fairly awesome.