yeah, I noticed that while trying to thing about how one would except from such a contraption. They appear to be strapped into the thing with a harness, requiring them to get both their hands to their waist to fiddle with the straps to free themselves. As far as exit locations, the rocket launcher and it's backblast would probably prevent the region directly behind from being an exit, so I assume they would have the sides in the back open up, which seems like it would be awkward to enter and exit. I can't imagine they could convince anyone to climb into such a thing, but life was cheap in the soviet union at the time.
And then of course their is trying to imagine how it's use in an attack might take place...
Visibility is strictly limited in the forward direction, limiting situational awareness and target spotting, so I would imagine you wouldn't climb into the thing without knowing exactly where the enemy is. The attack would presumably involve speeding towards the enemy, relying on your speed and the enemy's sheer disbelief anyone could be stupid enough to climb into such a thing to avoid being obliterated. After unleashing the rockets with questionable success, you now have the task of escaping the enemy. Assuming you still have propulsion rockets to fire, I would imagine this thing would not pull 180 degree direction changes flawlessly. It is easy to imagine why this didn't make it to production...but then again this was from the same people that brought the world anti-tank dogs.