When it works, it works very well. Stutters that may be experienced in a "live" viewing are all removed, with no apparent loss of quality with what is essentially a recording.
Unable to record (eg) the latest Apple WWDC
A useful adjunct to MacTubes
Yes - I paid for it, and I am happy so far - but I am looking forward to some improvements to the UI
HINT: don't try to overload it with too many videos recordings all at once.