A quick check. Are the Misumi on level with Hiwin and similar? Anyone tried them?

I am looking to buy some 12 size for 3d printer so checking if i could avoid the hassle with ordering Hiwin from China. Seems on 12 size price is almost same with no notable savings, hence the question

Any other 12 size source that come to mind? I have seen the chinese ones at Robodigg but i remember my bad experience with 20 size test bearing block a year ago. Could things have changed? I see now ebay 302126767975 even have a blackened rails. Claiming hardened bearing steel.