Linear feed back systems are a thing of beautiful in operation. The additional programming and required electronics tends to detract from the objective. A prominent question is, what kind of linear drive is going to be used. Each has advantages and disadvantages. The most powerful is the lead screw and nut, speed can be a factor to get power speed is often lost.
Ball nuts can easily get foreign material in the internal raceways, requires extensive cleaning.
The replaceable nuts have a lot to offer and has become our choice for driving wood routers. Probably the fastest is the Cable drive. This is where a thin aircraft type cable is rapped around a grooved pulley. The grooves are helical to make sure the cable does not wind over itself. Power is limited to the strength of the cable and that cable has to be wound around the smallest step distances.