Got a lot going for it, but some pretty big oversights in my opinion.
This is a browser by nature - not including tabbed window functionality, not even the ability to have multiple windows at once is almost a deal-breaker in itself.
Since this is also a download application, I'm surprised that there isn't an option to enable/disable/cancel automatic video loading in the browser. Presumably the purpose of this app is download whatever flash video that catches your eye so you can watch it later offline. When downloading multiple videos, being able to turn off the auto-load would certainly help bandwidth burden.
When downloading more than 4 videos at a time, errors continually occur to one or more of the downloads.
No ability to select individual videos in the progress window.