When the crew of the Enterprise came back from their weekly "Ride around the galaxy", They all saw the Excelsior and became jealous. But, the only reason why they were jealous is because the thing that hangs under the ship was longer than the disc-thingy on top. When the Enterprise went out for another "stroll", starfleet got sick of it and sent the Excelsior after it. When they tried to use the Transwarp drive, it failed and the entire ship broke down. Later, they rebuilt it, and they fixed the bridge so it doesn't look like it came out of a Sci-fi movie from the 1970's. However, they got rid of the transwarp drive system, so the Excelsior completely failed it's purpose, and it was a waste of time and recources.