Have been using the new 3331 V3 tactic with Brisbane Roar is Australia, here are my results so far:
As you can see defensively, it has been really good. The attack certainly seems to have improved, I've scored a good amount of goals, and my striker has played 14 of those league games, scoring 8 goals(could be better, but not bad). Possession is pretty good with this tactic also, most matches I play I will get 50% possession or more, and this is something I personally really like, I don't really care for Mr L's The Rock tactic, as winning games with 40% possession doesn't interest me! The only real improvement I can see you making with this is that I find the opposition create too much chances and CCC against you, even though I have kept a lot of clean sheets, I still find the opposition getting too much chances(although I think this will be a hard thing to achieve) I also think if there was a way to get the striker to score even more goals, you would really be onto something!