The Boss RV-5 reverb pedal - it's actually great apart from the Spring reverb.

Reasons to love the RV-5: 

-Modulated reverb. Yes yes yes yes yes yes yes. 

-The hall and room modes are really rather good. 

-It doesn't feature anything useless like dynamic reverb


Reasons to not love the RV-5:

-the Spring setting is shite. It's got a quack to it like a rubbish compressor.