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I've got to say, I was quite doubtful that it would work, but having had used it, it really does.
That's not to say my 10 month old happily lets me use it on him, he screams, kicks and cries, but it does the job.
Only thing I have noticed is that the tube does unclip occasionally whilst in use (especially with a thrashing, resisting infant) but it does click back in again. I've not yet had to change the filter as the snot never really gets further in than the tip of the chamber. Really handy tool, and will definitely help your helpless congested infant find some relief.