Finally got a thousand kilometers (1,015km to be exact) on the ZTTO DT Swiss Star Rachet 54T upgrade kit. Took me longer as it had been raining the past couple of weeks and cutting my rides few & short. Anyway here's the results.
As you can see from the picture, the outer edges of the ratchet showed some wear. You can see the color changed from silver to bronze. For comparison, refer to pictures on the original post, the 18T rachet had seen pretty much close to a thousand kilometers as well before the upgrade. The springs are pretty much unaffected. Performance is still very good and unaffected by the wear.
Is it worth the US$32.60? To be honest, I've never seen a used original DT Swiss 54T Star Rachet to make that answer. And judging from the wear, I'm probably going to get a few more thousand kilometers from it. But at that price, you can probably get 3 upgrade kits as compared to only 1 from DT Swiss. So I'll leave the decision to you.
So there it is. The thousand-kilometers review of the ZTTO DT Swiss 54T Star Rachet upgrade kit.