[Mezzy]

Downloaded and purchased TubeDigger today (after finding it in this very thread)

It worked very well initially for a number of videos over 2 hours, downloaded ~20 videos with no issue at all.
Sadly now responds with 'failed' on the vast majority of videos I try (1 succcessful out of 40+ tried). I wonder if F4F has a means of detecting and blocking this type of software after a certain period of use?

Would still recommend it if you have a smaller number of videos you want (still works out cheaper) but, from my experience at least, its not a guarentee to get the videos you want.