I ended up buying 3 sets of these to build a machine. They are performing perfectly. Would recommend for anyone doing a home project, will update after a year or so to see how they hold up but it looks promising
All components fit well together and linear rails slide without friction or noise. This has a great value for the cost and is helping me to build a CNC router easily.
This kit has very smooth motion with minimal resistance.The tolerances are surprisingly tight for the price. I_l definitely use them again for making custom saw stops.
Overall met expectations at a low price, however, it did not come with the plum coupling as mentioned in the description. However, the high cost to ship for returns was more than the cost of the coupling
Very rigid and works well! The rails don_ slide super easily but that_ probably just preload on the rails. I had no issues aligning them and had no issues with binding. Great for the price!
Kelly 
