I just played a 500 point game at my local game shop and it was a lot of fun. The Legion players at this shop are all trying the actual game mechanics and rules and not simply duking it out. My opponent and I chose the objective, conditions and the manner of deployment. I had a 495 point army and he had a 499 point army. We both played rebels (I was the "dark" rebels) and it was interesting to see my opponents version of a 500 point army vs. mine. I had 1 heavy (Air Speeder), 2 basic troop
It's all a bit wonky, I reckon, until you get to 800 points. Below that, balance is a little strange.
I think general consensus on the T-47 is to keep it on the edges, murdering things. Limit how much can hit it on any one turn.