Ok, had a chance to use it today.
RCBS, not impressed! Cumbersome and I found it difficult to hold the case in the funnel because the length of the funnel spout is as long as the 9mm case itself so there was not much to hold into. The powder was difficult to get to pour smoothly and tapping on the funnel was necessary each time which I found difficult since there was not much to hold onto. With the smaller cases it's too easy to lose a tight seal since you hold everything in your hands to fill and I frequently leaked powder as a result.
Maybe I wasn't doing it correctly but switching back to the old metal tray solved the problem. IMO, I think if it were made of metal instead of plastic it would work better.