I have two 2180s are home (one on a 6x2.5x.25 and one on a 4x2x2.5) and could not be happier with their reliability and performance. One of them used to be a 2080 but olli was nice enough to sell me a 2180 head for a price i couldn't resist! Like previously said they hold a heap of media and handle a hell of a bioload.
Kills two birds with one stone and having a 500w heater built in and digital temperature display and alarm on your tank is bloody great. Worth every dollar for a bigger tank and would be perfect for a 5x3x2.