Free calls to Malawi and to Zambia

It seems that LowRateVoip is offering 200 minutes per week of free calls to Malawi (landlines only) and Zambia (landlines and cellphones) for users of their MS-Windows client. Using the same client, calls to SA cellphones are also advertised at under R1/minute which is very reasonable. Any current users of LowRateVoip, please comment on this post!