I have the opportunity to purchase a used version of one of these. I have been searching the forums for info on recumbents as I have never owned one. In various threads there was discussion regarding the lower end versions of these models, and it seemed there were problems. It was also mentioned that the USX model was better and perhaps did not share the same problems. But the threads seemed to end there. Can anyone share their experiences with the USX models? Are they better, more reliable, what are their issues, comments...? I would really appreciate any feedback. Thanks in advance!