My wife rides a EZ3 USX Sun Recumbent. We have had it about three years with no problems other than creaky spokes. However the frame must have been built crooked. It leans to the left just slightly. Enough to bug me and enough to wear the front tire uneven. There is no sign of any frame damage. No paint stress that would show bending is taking place. It appears the building jig was not straight and got welded together that way.
From the seat position you can easily see the upper and lower frame do not line up. Only problem is the front tire and that can be mounted backwards to wear out the other side.
Have you ever heard of this complaint or do I have the only one???
Wingryder