However, other posters have said that with hull upgrades, it's a lot better.
Upgraded armour certainly helps the Eagle deal with weapons fire, but let me tell you from bitter experience that it's no defence against rocks. If you slide an Eagle -- or indeed several Eagles -- sideways at full lateral thrust into an asteroid, be prepared to do the immediate walk of shame down to the insurance office.
"Oh, here he comes again. Sunk more Eagles than Tiger Woods, this one has."
It also has problems with gimballed weapons due to the mounting position, and laser weapons overheat at an insane rate. I suspect the latter is part of a more general energy bug, because locking down hardpoints seems to excessively cool the ship down too regardless of engine output and I'm almost certain that's been reported elsewhere.
Eagles are ridiculously fast and manoeuvrable, and the sound effects as others have pointed out are phenomenal, but for me with my preference for asteroidal bounty hunting it's just too easy to destroy them on an errant boulder while doing an Obi-Wan through the planetary rings. But if you prefer your combat in open space, or are simply a lot quicker at reacting to the proximity alarm, then you can have a lot of fun in an Eagle.