My original Hercules pump had problems with the bottom pad falling off after 2 years which isn’t too bad. I just got their new version which is called the XSeries (I got the X30) and what an improvement! The pump feels like it’s better made, it’s easier to use and the pad at the bottom is removable and not stuck on with glue. It also feels easier to pump and you can feel the pressure more. I wish I’d gotten and X30 sooner but anyway I’m happy.