- China ELM327 use non-original ELM327 chip and other components. Their quality is not always stable (adapter purchased today may be fine, adapter purchased tomorrow may be defective). As a result, in majority of cases it is not possible (too risky) to use it for operations that require long time of work under high load, for example on firmware update. Besides, mechanical HS/MS switch is not convenient and, that’s more important, doesn’t fit requirements for certain service functions that require simultaneous access to HS and MS CAN buses.
- Solutions like OBDLink MX BT/MX+ and ELS27 are much more expensive. For some reason, Scantool doesn’t offer an adapter with USB interface and MS-CAN support, and wireless solutions are not optimal for operations like firmware update. ELS27 is also very expensive, original is manufactured in Russia so long period of delivery to US and some other countries.
- Against china ELM327: OBDLink SX contains original Scantool chip of known quality. Quality of the adapter is good and stable. Adapter has much higher USB interface speed than ELM327 adapters (2Mbps vs 0.5 Mbps).
- Against OBDLink MX: OBDLink SX is much cheaper (cost is equivalent to OHP ELM327) and much faster (as has USB interface that is much faster than wireless one)
Against ELS27: OBDLink SX is much cheaper, faster delivery.
Modifying an OBDLINK SX OBD-II USB Adapter for use with FORScan (PDF)