Being able to interchange between different suppliers can be priceless when looking for replacements. The drylin T range from Igus is an exact replacement for other linear guides, with the same dimensions and same hole positions; but the drylin T slides instead of rolls.
In addition, drylin T linear guides are 100% lubrication free. The video highlights the similarities as well as the differences between drylin T and recirculating ball bearing guides.