I'm getting a strong "save your cash" vibe from most of the posts here, so that's what I'll do.
But if folk want to share there fantastic experiences of leash saving their bacon, I would love to hear them!
My very first run was saved by killing a Sankaku elite guard and an Akuma drone with another Akuma. It was a pretty crazy level layout with a ton of overlapping sight lines and a very well guarded exit. I would have run out of power without leash. That being said, I don't consider it a particularly great program; it has a narrow niche but within that niche its effective.
So, where were we? Ah yes, Banks bleeding out. All but one of the guards move away, the other one stands where he can see Banks out of the corner of his vision so Prism waits for him to go away.
I don't feel much need to go into detail about the rest, since its mostly running away from tagged guards. The alarm level 4 reinforcement comes to the same elevator Banks was downed next to (of course!) but even though he's not tagged I know he won't catch anyone as long as the team keeps moving.
In the end not only did we run out of power, but rapier's cost went up to FIVE, meaning it costed one power to use even with seed. This proved to be unfortunate, as the one area we hadn't explored had, well see for yourself:
Fortunately the stealth part of this mission has passed, so we subvert the cameras by... ignoring them and running past. A single camera can only trigger once per turn, adding a pip to the alarm level and sending an guard to the triggered location. I actually see sound pings pretty close to us, but not close enough to catch us. This time.
So, I think that was a pretty successful mission. The level layout was all funneled through a few well watched rooms and the guard elevator was horribly unlucky. But on the other hand the part of the mission I was actually concerned about was the drones. There was only one in this building and it was in a totally harmless location. We made off with all the loot on the level, except for the ~30 credit anarchy bonus Banks could have gotten on a single guard and the med gel we spent. And, of course, there's now a new member of our team!
Monster has nothing for us currently (although we can still sell to him). I forgot to take a screenshot of the mission results screen. We're two hours away from the next day, so no new missions. Here's the map:
And here are the agents. Their gear is all shuffled around from the mission, but I'm basically OK with how things ended up.