Nik, it's in a 4" pot, and I would say that yes it is a robust grower. There are fans crammed into every nook and cranny of that pot. I have a feeling it will be one that needs regular division to keep it to a managable size. But if one had the space I'm guessing it would make a spectacular specimen plant. Here are a few pics of the whole plant with Tucker the miniature Dachshund posing for scale.
BTW everyone, I bought this in spike about 3 weeks ago so I can't take any credit for blooming it.
Thanks for the nice comments anyway.