Beautiful fit, no backlash. Will buy again.
2 pcs ordered Nov. 27 2020 - received Dec. 10 2020 - shipped with aliexpress standard shipping in a cardboard tube and bubble plastic wrap. Satisfied with the handling and shipping time and the quality, both lead screws seem straight. Usual vertical and horizontal play of the brass nut even with the smaller nut + spring (anti-backlash mechanism). Tolerance seems pretty good though. Very satisfied.