Looks really solid but one of the rail guides showed up with a bent tab in the front. I'm not using these for 3d printing but if I did these rail guides wouldn't work

had problem with shipping and they were very quick to remedy the situation. Top shelf company, very good to do business with, looking forward to more in the future.Also the rails are good, as expected

These were bought to upgrade a home made CNC machine, and they sure do a nice job of being smooth and quiet. I will be upgrading other axis on my machine with more of these as my other rails wear, for the money I don't think you'll find a better linear movement rail.

This works really well and I will order it again for another project. Very strong. Very smooth action. Careful when putting carriages on and off of rails (which I will never have to do again, now that the project is complete). That's because I didn't realize I could knock ball bearings out if I was sloppy doing that (only 2 or 3, not an avalanche). They went right back in ... once I *found* them!

Everything Packed well, nothing bent or damage. Installed on my Workbee Y axis and I am cutting today

Honestly quite surprised with the quality/price. Purchased for a low budget prototype seeing intermittent use and I am quite happy with the results. Threads in the bearing blocks are clean and tight (M4) and the mounting holes for the rails are clearanced ~1mm (Again M4) for alignment I'm guessing. Overall length varied in my two rails by about 2mm but I really can't complain about that.

So far so good. These are super tight. I am amazed at the amount of tourqe thees things can handle. I thought these would be kinda sloppy but they are great.These are a bit rough when sliding and feel like the balls are a little too tight but I need to align the two rails to be more parallel. Worth the money so far!

fast shipment, good quality

Exactly as describe, good quality. Shipped out fast too.

Very happy with these rails (bought 2 pair) , the blocks are extremely tight and run smooth across the rail. I am using these on a 1500mm x 1000mm CNC and am still in the process of making mounting blocks. I am very pleased with the construction of these rails.But, the only gripe I have is with how these are shipped. both rails are shipped in a single plastic package with 2 rails inside with blocks already attached. Packaged like this made scratches on the rails in a few spots that I had to polish, hence the 1 star downgrade.I would like to see the company wrap the rails seperately, as well as the blocks. but I suppose they can't trust consumers to put them on the rail properly.