SECONDED - best purchase I have made (in booster pack when it was released)
Also, save your points for sales. I have bought so much more as most of the useful stuff comes around in sales cyclically.
I discovered a nice feature of Ninja Run the other day: it stacks with Sprint and the premium Sprint powers, all of which can be slotted. (I haven't tried it with other movement powers.) Add NR to Sprint and the inherent running boost, just filling their base slots, gets decently close to basic super-running.
Not expecting it, but I found that the Ninja Run stance works well with the Shield defense powers. You run around crouched behind your shield.
I had fought my way thru to the end of the mission, then "Disconnected from Mapserver". After waiting a minute for it to come back, I instead see that half of the servers are offline.