The Fast-8s are very nice drivers .....
I ordered a couple of pairs and they were purchased by local customers ..... so I don't currently have any in stock.
There are a couple of photos and some comments in the thread I started
here.
It's kind of cool that the surrounds of these drivers are translucent.
If there is a light behind them, they appear to be "glowing" .....

Like the Betsy drivers, they roll off pretty quickly below 80 HZ or so and will benefit from some bass reinforcement, but the upper bass is very quick and tuneful.
Happy listening,
Randy