I received the 516 mull. It was very well packed in a wood crate.
I am now building the electronics. So at this time all I have been able to do is take the cover off and look it over.
1. It is verylwell made.
2. bearings on both ends of the x,y an z axis.
3. Very pleasant hammertone paint job on the metal covers.
Smithy customer service is very good. Pleasant to talk to and follows up on questions after the sale.
I have a seig mini-mill and the quality and construction is much better on the Smithy 516.