
If you can get a working one, it will work well. The challenge is getting one that works. I would say they have very poor quality control. Don't expect to get what you want in a hurry, because you'll have to keep trying until you get something that works properly. But I kept going until I had two that worked properly.

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Iverntech MGN12 700Mm Linear Rail Guide With MGN12H Stainless Steel Carriage Block For 3D Printer And CNC Parts
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π§ High-Quality TIMKEN 6203 2RSC3 6203 2RS Bearing - Size: 17X40X12mm
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π Wheels Manufacturing Ball Retainer Bag: Convenient Storage and Protection for Your Ball Retainers
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