There is no doubt that this machine ,by design ,does what it is made to do.. but there is room for improvement. My wife is no longer the petite tight bodied creature she once was (baby got back now ) and with that said the way the buisness part of the machine and the way it was placed sat in the middle causing her to be not completly sitting on the seat makeing her uncomfortable m not letting go she felt so i comfortable she got up n walked away. So i took it to the garage and took the black plastic off the motor by remiving the two#2 phillip head screws i spun the plastic 180 deg and found there was no holes so with a drill and .125 bit one was created mirroring the factory side even counter sinking the hole .. i reassembled it and viola , she said it was night n day she didnt feel like she was sliding off the machine and was able to reach the higher level orgasm we were attempting for her to achieve. The phone app works very well and has different choises to play with .. she is 5’ 180 lbs . All in the right places so if you have the same experience she had,, this is the fix see the pics below