Chad, did you mean the trickler or the dispensor? I thought you meant the dispensor, that's what I have. My dad has a trickler for his, but after using it myself, it's not exactly what I thought it was going to be... the dispensor is worht the cash to me, and much better than the trickler... which is now a discontinued item.
Funny thing Ian, the RCBS PPro scale I got for my dad, it doesn't ever seem to need calibration, wt. doesn't wander upward when warming up or nothing... mine needs it every single time. I always calibrate his when I use it anyway, just in the habbit I guess.
Like Ian, I set my Redding dispensor to drop about a grain less than the dispensor is set to trickle up to, pour it in the pan and hit dispense. When I'm done seating a bullet it's done too.
The dispensor dumps a little slow for me to use it to dispense the whole charge wt, if you're using it on cases smaller than 308win it should work better that way. Even with the 308win using stick powder's too slow for my rate of loading. Get up to the 416wby and HAHAHA! Now way I'm waitin on it for that one.... ever.
If you wanted to size a case and prep it completely while dispensing the whole load on the RCBS, well, it would work fine that way. I just do it differently though.
They really do work nice, I recommend them.