I own a Longjia Mojo GT50 (Different parts of the world its Longjia LJ50, Exactly 50 and its very similar to a Sachs Speedforce 50) and have had it for nearly a year and its going really well and have had good use out of it as a run around scoot for doin small pickups and pizza deliverys on weekends (as i can get around the city quicker than a car) but now im starting to slowly do it up, not so much the performance side of things but mainly the looks at this stage.
I just had to go with the Sachs Speedforce 50 on the models list as my scoot isnt there but looks close enough lol