Neat product. Three stars for performance, one star more for price! For half the price of HIWIN or THK rails, you'll have to adjust your expectations. These are cheap Chinese rails but workable if you can live with a little vibration. The car is rigid on the track but the bearings seized when it arrived. I lubricated the bearings and it got a lot better. Now the rails move with almost no resistance. There is very slight vibration that you can feel when moving as the bearings rotate - this shouldn't be a problem for most FDM style 3D printers. Finally, they are probably still stiffer and more compact in a linear motion system than LMU bearings that run on a rod.
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