The EZ Sport was designed by non other than Gardner Martin. The man knew what he was doing.
You got a great bike for a fantastic price. The weight is really not that much of a factor. I alternate between my Tour Easy, Volae Tour, and Sun EZ Sport. I really enjoy them all. The EZ Sport gives the comfort of a LWB, a seat height that seems un-intimidating to the newer recumbent rider, yet the bike is still fast enough to enjoy group rides with other recumbent riders and diamond frame riders. I often exceed 30 mph in the middle ring on mine. The bike is also very durable so you can ride hard and trust that it will hold together very well.
Enjoy your new to you bike!!