Very happy with these rails (bought 2 pair) , the blocks are extremely tight and run smooth across the rail. I am using these on a 1500mm x 1000mm CNC and am still in the process of making mounting blocks. I am very pleased with the construction of these rails.But, the only gripe I have is with how these are shipped. both rails are shipped in a single plastic package with 2 rails inside with blocks already attached. Packaged like this made scratches on the rails in a few spots that I had to polish, hence the 1 star downgrade.I would like to see the company wrap the rails seperately, as well as the blocks. but I suppose they can't trust consumers to put them on the rail properly.
Jon Faris 
