here but became a justifiable expenditure in the process.
For 145 points, you get two brightlances and 2 shuriken cannons. You can get a comparable falcon (2 shuriken cannons, star engines) for 140 points but
the pulse laser doesn't get the lance rule, it can only move 6 and shoot everything (instead of 12"), and it can't shoot if it moves enough to get a save. Of course, you do get armor 12 and a transport capacity of 6 and the potential to take a holofield upgrade. In terms of value for the points, I would give the edge to the falcon, but the nightwing still looks cooler and it also doesn't take up a heavy support choice which is huge for an eldar army.
On the battlefield this thing's role is fairly obvious, find the enemy vehicles and remove them from the game for the first few turns, after that it can hunt down some the last guy or two from a unit but with armor 10, it has to be fairly confident of taking them out, otherwise even return fire from a lonely bolter has a good chance of taking it down or at least stunning it, which is typically the same thing.