Yah, some one else had mentioned that they work great on RCP grates and basically as good on the smaller diameter grates and that is what made me pull the trigger. They mentioned that the chargon is basically a 10mm opening so it barely fits the RCP grates witch is optimal.
I was thinking it would take a lot longer to clean the grates since you have to do each bar individually, but when I did it last night, I was surprised how clean it got them with just 2-3 swipes back and forth on each bar. I don't think it took more than a minute or so to clean my grates and when I checked them with my hand to see how clean they were, I was surprised. They were much cleaner than I was ever able to get them with a brush after a couple minutes of brushing. And, the bonus is that it not only gets the tops real clean, but it also cleans the sides very well too. I figure every few cooks, I can turn my grates over and do the bottoms as well to get them totally clean.