If you are worried about the slate thickness, 25 mm vs 30 mm, I wouldn't worry about it much. My Diamond professional came with 25 mm, and not the 30mm as stated on their web site, plays fine. When I questioned them after about the slate thickness not matching up with what their Web site said, they said sorry, and that was it. Also questioned them as to why the rails were 3 bolt instead of 4 as the web site stated, same response, sorry. Regardless as to whether it makes a difference in the play of the table, those were two items that influenced my decision on the purchase of a Diamond table. I will say that the side rails are massive and one piece, unlike the 2 piece Brunswick home table I had before, and don't see any need for 4 bolts per section. Last I checked, their web site still said 4 bolts and 30 mm slate, may have changed it by now, it's been 2 years. Just looked, web still says 30 mm for 3 piece, mines 25 mm, from what I understand 30 mm is only on 9', mines a 8'. Website is quite misleading and you would think could have been changed in 2 years time, like they said it would.