Having used these for every match I have attented (about twice a month) since I got them, I can say that the only regret I have is that I did not order five of them to begin with. That will have to be mended soon
Untill recently I shot different loads in my revolvers and rifle - and I learned the hard way that my revolver loads were too short for the action of my 1873 rifle. At the same match (different stage) I managed to loose count of my rifle ammo - and went to the stage with only five in the tube As soon as I came home from that match, I ordered my loading blocks.
In my experience using loading blocks like these makes you not only faster at the reloading table - it also allows you focus more on the stage ahead while reloading.
The loading blocks has held up through blistering heat, cold and rain.
Edit: Just placed an order for three more.