The E-Wing is one of four "Wave 4" expansion sets for the X-Wing miniatures game. I think there are some good reasons to add at least one or two E-Wings to your Rebel fleet.
It is a little costly, but the base stats (3 attack, 3 defense, 2 hull and 3 shields) are pretty good. It can also do four different actions, and take many different kinds of upgrades.
(1) Knave Squadron Pilot, a level 1 non-unique pilot that costs 27 points (yikes!).
(2) Blackmoon Squadron Pilot, a level 3 point non-unique pilot that costs 29 points.
(3) Ethan A'Baht, a level 5 unique pilot that costs 32 points, with very nice offensive special ability that reads, "When an enemy ship inside your firing arc at Range 1-3 is defending, the attacker ay change 1 of its [hit] results to a [crit] result."
(4) Corran horn, a level 8 unique pilot that costs 35 points, with another great offensive special ability that reads, "At the start of the End phase, you may perform one attack. You cannot attack during the next round." Just missed destroying a ship this round? Corran Horn lets you try again!
It also includes two previously released upgrades (Flechette Torpedoes and Advanced Sensors), one upgrade that also comes with another Wave 4 ships (Outmaneuver -- a 3 point elite talent that reduces your targets agility by one if you are not also in their firing arc), plus TWO astromech droids that were exclusive to this expansion at the time it was released (R7 who costs 2 points and lets you spend your target lock to make an attacking ship reroll any number of attack dice; and R7-T1 who costs 3 points and let you perform a free boost action when you acquire a target lock on a ship inside your firing arc).
As with all expansions, this one includes all tokens, dials, etc. that you need to use this ship in a game (though a copy of the base set is still needed to play).
Given that the cheapest one costs 27 points you'll never need more than three for a standard 100 point game. At a minimum, I think it adds enough to get one or two, which is what I did to start.