The system works very well, it's easy to use with all required features included in one interface.
There are no flaws at this moment since I have only been using few weeks; however there could always improve by adding more functions or make some changes so as not everyone knows how every feature work (I think they should add an option where you don't need any training). We like mostly everything about SG platform but we dislike sometimes when people tend spamming other users' profiles instead sharing useful contents/articles etc.; therefore i would recommend having both options available - "Public" vs."Private". Our main goal was managing our community from different perspectives including memberships & moderation activities plus keeping track of statistics regarding posts published / comments received etc..