I have certainly found that the cunning diagonal seat adjustment and the adjustable pedals on the Explorer gave me the most comfortable position. The lumbar support was good too. As far as others go R22 - not too bad, Gazelle - don't go there, Lynx - pretty good (but the Westland Vibrator gets you in other ways), Bolkow - poor, EC135 - suitable for the boyish bottom only (unlike mine!).