Polar Bear is pretty awesome. Just ran some of that myself. My 2 females (out of a half pack, still got half) were kinda neglected and were in too-small pots with no supplemental feeding (water only organic soil)..... giving them a round 2 right now, about to go in flower.
Here's my polar bears before last chop. I'll remove the pic if you mind - hope its not a problem.
These have much better structure when topped, unless you're running SOG. The side branches grow to be very sturdy and grows vertically quickly if pruned to 3-4 tops.