Here's the bottom line:
When you're a lowbie, EES owns all.
Then you get Barrage, which, while somewhat random is almost on par with EES if all 5 shots land, but you can use it every 5 mins not every 2 hrs.
Finally you get Sidewinder, a very nice WS that is inaccurate but with the right setup lands 95% of the time.
The only advantage to having EES after you get Sidewinder is that it doesn't require TP(though you can use an icarus if you need to for Sidewinder) and is 99% accurate. Imo, post lvl 55, this 2hr is {Too Weak} and really almost useless except to finish an exp chain fast. Especially with the latest RNG nerf, they should give us an ability that let's us solo easier, something that works equally well in melee range. ><;