please i really need to know if there are any issues with the m3 simply and r4 and please i need to know the differences thank you
They are almost identical, both in build and firmware; you wouldn't go wrong choosing one over the other. Allegedly the R4 firmware updates are available a day or so earlier than the M3DSS but that is a very minor difference. The M3 group has released various other adapters in the past so one might say they are more experienced and have better resources, an example being the M3 Forum community.
