I'm also interested in one of these, a grow buddy had a trimming party one time and roughed them out with one of these and then we finished them by hand. I was ok with it but one of the guys there said he thought it was knocking more of the goodies off the buds than he cared for. I'm a one man army over here at my place and even if he was right to some degree I might be ok with the boost in production, might be willing to compromise a bit if necessary. I mean you'll still recover that keef anyway so what's it matta ? And I will likely be dealing with more to do than I've ever been faced with.
The last couple years I've been using a basting brush with silicone bristles to rough off the bigger leaves and basically I knock off anything I can with it, and that has worked alright.