Video Purifier is $396 dollars.
JES Video Cleaner is FREE.
I've used JES Video Cleaner before and it's not bad at all. It is something that's definitely worth having in your toolbox. For nearly $400 I don't even need to try Video Purifier especially when the last version had:
"...a serious bug, which under some circumstances could cause start and stop commpands in playout mode to fail. It could leave both the user and the application in a state of confusion."
And the latest update mentions that the "PPC code has been optimized" although it's listed as just "Intel" under the platform category at Macupdate.com. That leaves me in a state of confusion.