The rails are alright, seem hard enough even though it doesn't have the hardness rating officially on the product information so only time will tell on the reliability. Theres a little bit of deflection when measured parallel to each other, less than .010 inches total deflection over 1500mm which is fine for what I plan on using it for. Not a cnc but a wall mounted hybrid circular saw panel board saw. Its more than accurate for woodworking and I doubt it will ever meet lateral forces, maybe some small debris. But that is all from your friendly neighborhood cracker and his simple cracker machine. Why would you put that at the end of your product description, what's wrong with you, lol. I don't know, I just gave a racist 5 stars because the price is good and the product is good but maybe try and hide the racism a little bit, c'mon.
Geraldo Bispo 
