I apologize in advance if this topic has come up before. I'm about ready to spring for a DF 500. I have 'concluded' that it would be a much more versatile machine re: case goods, etc. As long as I am fanning out the money, I am also pondering whether to go ahead and purchase the $295 assorted Domino Beach Sustainer Kit. The various size bits alone cost @$200. My main concern is whether or not [2] 4mm x 10mm tenons will be robust enough when applied to an apron/table leg combo. I have two tables to build - @64" long x 35" wide. Anyone have any experiences using the largest tenons for table construction? I'm really reluctant to spring for the larger XL. TIA.