I like the keys because they help stop errors caused by the vise slipping, and also take away the requirement of tramming in the vise for most work. With snug fitting keys, simply putting the vise on the table and bolting it down gets my vise within .001" over 6", bumping one corner with my palm and then tightening it down gets it under .0005" over 6". The vise can be angled by simply removing the keys temporarily, two screws. The easiness of moving the vise on and off the table prompts me to take it off and bolt stuff to the table, or simply slide it to the end of the table. still in tram, and also to move the vise to different lateral table locations regularly, helping to equalize the wear along the lead screw and ways. That long table is meant to be used, and not just for loose tools!