Mechanical Options
Vertical Screw		Sliding Bar		Phoenix Redesign
Pros	Cons	Pros	Cons	Pros	Cons
Very stable base   Easy entry and exit   Known angle measurement   Natural movement	Large and complex   Structural issues   Moving power cords	Comfortable design   Ease of entry/exit   Easily adjustable for wide range of body sizes   More compact design	Not adjustable for leg widths   Unknown angle measurements for now   Very elongated machine	Elimination of crotch-bar   Stability   Based on proven design	Proper body alignment   Ease of entry/exit   Not easily portable