Works almost on all sites with video content including the funny ones 😁🍻 You can choose only one folder for all your videos or select using the 3 dots right form the download button and hit "save as".
No watermarks if you use the standard format which is .mp4. The quality of .mp4 format is perfect.
If you want some special formats like .avi, etc. you have to pay as far as I know.