I originally purchased this a while back for both me and my wife. The f machine is easy to build and comes in a storage case. It’s length throw adjustable which I was a little apprehensive about as it doesn’t seem like much in and out motion but trust me it’s enough. And the dong that comes with it is very jelly like great for beginners as it minimises the risk of injury. The machine comes with a vac u lock attachment but not many toys are vac u lock so I purchased the adapter kit for suction cup dildos. The f machine hits all the buttons it has good throw, can keep going and speeds no human could ever replicate. Great for restraint play or dp play without the awkwardness of another person (for some people) It’s very expensive but one of the best sex toy purchase I have made I just have to save up for the milking machine now :)