Actually, a `slow burner' denotes something that takes a while to get going. Sadly, `The Echo' goes so slowly through most of the film, that you're probably asleep by the time the last act (and by `last act' I mean `last few minutes') comes along (either that or turned it off).
The film follows a man recently released from prison, who returns home to find all sorts of spooky goings on in his apartment. The film start predominantly with him wandering from room to room, trying to work out where various noises are coming from. It is nicely shot, which does give it a suitable creepy atmosphere and, every now and again, there is the odd eerie scene.
However, it's all too little and not often enough. Whatever spookiness is too sparse to really be bothered about. The ending isn't bad. There's the obligatory `twist' (or should I say `explanation'?) regarding what's going on, but, by the time it happens, will you care?