Need Comparison: Several Sun EZ series
EZ1 CX: Hiten steel, 20/16" wheels, compact style bent
EZ1 AX: Same w/alum frame
EZ Sport CX: 26/20 Cromo frame long wheelbase style bent with curved tube "cruiser" frame
EZ Sport AX: Same w/alum frame
EZ Rider: 20/20" wheels long wheelbase with rear suspension, not currently produced, but was available in steel and alum.
All were designed by the late Gardner Martin of Easy Racers, built by Sun, and are distributed by J&B Importers (wholesale) making them readily available to almost any bike shop.
20/16 wheels are more compact, accelerate faster. 26/20 ride smoother, hold speed better. Alum models are a few pounds lighter, but have a stiffer ride. See sidebar at: http://recumbentcyclist.blogspot.com
for an EZ1 review.