Its Intermediate scheme, nothing more nothing less. I dont see any imbalances other than initial map placement that can be worked out by proper choice, like only fairly open islands (that is not too many closed spots but still keeping the complexity) on a best of 5 (or even best of 7) match. Gameplay is sometimes questionable, too easy kills on 1 side and very hard or impossible to catch up on the other side, but i dont think its a flaw comparing to other schemes, especialy in Free League. Often it forces you to be very creative (see darkmaul's first turn) and brings some completely new plays. I love suicide gaming and having like 30+ matches already i was never bored, i was only more and more hooked xd
And yes Free, i think it was Bytor that first brought up the idea, it was mentioned on NNN forums but i cant find the topic/posts anymore.