Assassins/backstabbing rogues are tricky to use, but with quick movement, Heartless and 2AP/2 stabs, they can be deadly.

You really have to watch the stance of your opponent to figure out where to b-stab but once you do you can b-stab anytime.

Pros
- b-stab = 100% crits, for me I took out archers and mages before they ever had a chance to go, even when they were hiding behind a wall of tanks, (using Invis to manoeuvre into position) you need a retreat plan though if you will be surrounded by hostiles with no support
- lots of status to apply to temporarily disengage key foes, e.g. Trip, charm, etc.

Cons
- mages in party will have to watch their area spells to not harm/impede the rogue since daggers have 0 range
- you need to plan an exit strategy since you are not suited to tanking unless you want to hybrid Man At Arms with Scoundrel.

I like it but it's not everyone's cup of tea