I own a Therminator.
Used it a few weeks back to cool a batch that had both whole leaf and pellets...the batch was done in a 26 gallon pot (not mine) which has no internal filter or screen or dam. I whirlpooled at the end of the boil, waited 15 minutes, then started running out to fermenters. I have an in-line trap with a screen that goes between the kettle and Therminator, and the only thing that showed up in the filter's bowl was hop seeds from the whole leaf hops! I think they "float" around easier than anything else in the pot because they are rather light, so they drifted to the outlet and got sucked out. My filter gadget has a bowl that can be unscrewed to clean off the filter screen, so I just stopped the flow from the kettle, dumped the seeds from the screen, and rocked on.
But...druing the entire run...I saw no pellet residue in the carboys or filter.
One caveat: The kettle I normally brew in has a false bottom and I most often use whole leaf hops...so after 10 minutes of settling after the boil I usually have a really good wort filter on the kettle bottom. This works really well for a CFC...but good luck finding an awesome variety of whole leaf hops to choose from! I'm working on a rotating pick-up tube to swap out with the false bottom when using mostly pellets. We never seem to have enough gadgets.
+1 on what Tom said regarding speed...I mainly find the time savings lie in the fact that I'm combining chilling with running off into the fermenters.