I installed this add-on because of the great reviews. Little did I know that it takes 15-20 minutes to 'download' a 4 minute 1080P video from youtube. The extra time is the combining of files (aggregation). After it does its aggregation you get a WATERMARK in the combined video, RUINING the entire thing! The developers say that you want to remove this watermark either don't choose the ADP option when you download or PAY them. Surprise surprise, the MAJORITY of HD videos on YOUTUBE have this ADP next icon to them. In other words, if you want download in HD you HAVE to choose the ADP version of the video. RIP-OFF! Did you guys PAY peeps for the 5 stars reviews or what?
Edit: Ok maybe was a little harsh in my review but this add-on works on other websites where the videos do not need to be combined together. Still your business model is flawed in this day/age. There are plenty of other (free) video download options out there which do not force users to do things they don't want.