Out of a battlenet-based settlement, RGC owner Roger "sir-rogers" Weber moved the project to a solely by him created client, one year ago. From there the platfrom evolved to one of the biggest and most stable places for DotA in Europe and America. The head administration is furthermore working on expanding into Asia, which for now are unfortunately left out due to connection difficulties. Unlike Garena, there are no room limitations, thus every user is able to stay and play.
Update: The channel, does not require a vouch anymore and is from now on publicly accessable.
A written tutorial about how to use RGC is available here;
A video tutorial can be viewed below
rankedgaming.com - Homepage (with Download option for the client)