My friend recommended to me a Chinese brand wheel spacer ，its BONOSS forged active cooling wheel spacers, with “active cooling”, knurling, disassembly groove, and other unique designs. I want to know, do these designs really have an effect, and Is it worth spending more money on these special designs?

 

The designs like "active cooling," knurling, and disassembly grooves may offer some benefits, but they depend on your needs.

Active cooling could help keep the spacers cooler if you drive in very hot conditions.
Knurling may improve the grip between the spacer and wheel, which could help prevent slippage.
Disassembly groove could make it easier to remove the spacers in the future.
If you plan to use your vehicle in tough conditions or want extra features, it might be worth the extra cost. But if you're just looking for basic spacers, standard options should work fine too.