Sir-Fritz has it correct. You get what you pay for, and in this case you get a sturdy flash cart that feels like a normal DS cartridge, not some flimsy thing that feels like it can break at any second. Plus, Team Cyclops requires more income to support themselves as they are based in Europe, where the standard of living is higher than most Asian countries.
Last, the CycloDS still comes with a decent MicroSD/USB adapter, whereas the cheaper flash carts stopped including those.
Here's another video fog isn't being displayed properly on several games. Nintendo life also reported this. Water Temple in oot water reflection isn't emulated properly either the whole point of the gimmick of that room. Graphical glitches and poor emulation shouldn't be present at $30 bucks