Just had my first hit with the Blackout 300 today. Definitely in the lineage of a Pure Drive. Much more comfortable, less tinny. Not noticeably stiff in my opinion. Swings fast, found myself whipping more forehands than normal just because it swings much faster than my RS 305 or 93P.
I have the WhiteOut in my bag as well, looking to see if that fits my game better. But the blackout is definitely a nice frame. Easy power. I think anyone from a 3.0 to 5.0 could find a way to use this for their game.