YouTube rippier for Mac

[CobraMacos]

Just to share an expirience:
I digg a solution to grab Youtube movies. Some of are sites where you put a link from YouTube and it gives you file with strange extension and small size. Some are really complicated.
My way was to use moviesherlock (moviesherlock.com or sm like this - please ask me - will rememeber). Really simple utility, that just works, and only 1 button in software.
[Solo personas registradas ven el link ].
I downloaded even HD movies!

But it looks too simple, has no player, but just works. It downloaded ~12 concurrent movies for me and actually slows down my system. Its possible to do search in [Solo personas registradas ven el link ] ([Solo personas registradas ven el link ]) and search results differs from what you see in YouTube. Thats strange.
Who knows - youtube results are same for same text? I loves cat (Simons cat / dog).
Why doesn't youtube allows to download its movies without external tools?!! It actually sucks!

Thanks in advance!