Your success in any MLM will depend on how good you are .No matter how old it is or how new it is.Remember in MLM It is you and Not the Company.No Matter which company you represent or when you join , your success will depend on only one factor i.e.you.
True - In pre-launch phase we get many advantages in terms of being close to company's management , getting in some heavy hitters but at the same time you have to work extra hard as there is no system in place .
In an old established MLM systems are usually in place and if you do just what you are supposed to do you can make good money.
So analyze yourself.If you have the guts to go out in open and promote a new concept without much of upline support , join a new concept however if you still feel you are a new bie and need guidance, join an Established company like GDI , Amway , Herbalife etc.
Rather than spending time on analyzing the answer to this question and waisting your time like an idiot , go and improve yourself .Go and improve your phone skills, your looks , your public speakign capabilities , your internet marketing knowledge and become larger than life.
If you have read this article till this point then i can say that success is not away from you.