This wide range is there because within the inbuilt pc in the treadmills. The fixed models S77 and S73 are quite good, S73 costs 1700 $ but has less HP than S77. A manual, fold up treadmill's obvious plus is that it is super foldable. The Yowza Keewadin treadmill is no inexpensive folding machine. http://Am_14264130.Mongdol.net/bbs/board.php?bo_table=free&wr_id=1045895