What can I say that hasn't already been said about Primal Scream?
I bought a double-fan in 2009 and then the following year gave a fan to a friend, so it took a setback. Still, even after 5 years since then, it doesn't seem to have increased much at all.
It is registered as a mid to late season bloomer. Here in my zone 6b garden, it usually blooms about three weeks between mid-June to early July.
This is as close as I could get to showing branching and bud count. It doesn't appear to be too high on either, but the picture could be misleading.
Even with the slow increase, it is a show-stopper and will stay in my garden!