Echo is a fuse a bit like the Trails node but it self catches the frames so there is no need to do any playback before.
Echo also have some more advanced features like seeing subframes, the posibility for each echo to have its own pivot and start/end frames.
Added in 6 minutes 1 second:
One thing I really really really want to add to the fuse is working DoD. As for now it doesn't do DoD and thus if you echoing a small dot like I have done on a big image it would speed things up A LOT and most of the time I'm guessing you don't want to echoing 100% of your image.
If any fuse wizard out there likes this fuse and would like to add DoD support, PLEASE DO! I have tried my best but calculate the DoD before all the transformation, that was too much math for me to handle.