This is my first set of dice purchased from this organization; they are, from what I can tell, very high quality.
For those wondering about sizing: all of the dice, with the exception of the d20, are SMALLER than the average die you'd get in a set. The d20 is a hair larger than a standard d20 due to its edges being slightly more pointed that a standard d20.
I would NOT recommend rolling any of these dice down a wooden tower for fear of scratching or damaging it. I have rolled several down my wooden tower and haven't seen any damage done yet, but due to their weight, I would be hesitant to give a green light to anyone else.
Overall, I am quite pleased with my purchase and will certainly be returning to this seller if I'm ever in the market for more exotic dice sets.