Chinese Trim router with 3DTek collet ...
https://i.postimg.cc/hv5tp7p6/Collet-Chinese-Custom.jpg
There are some slightly variable results with the 3DTek, but the pattern is clear (I think ..): the Chinese trim router is decent, while its collet is not. Perhaps it depends on the seating of the collet. I tried a few twists, but did not get different results in my measurements. The Makita collet seems very good and not really that different (no better, no worse) than the 3DTek collet. Looking at the rougher finish in the eBay version, i would not purchase one. I suspect it is the same, or no better, to the collet which came with the Chinese router. I did purchase the 3DTek, and that has now gone into the Chinese machine.
Regards from Perth
Derek