I'm still really happy with the Berk. It's not really noticeable while cruising or on the highway, but it comes alive as soon as you push it. It does make me speed up a little faster than I normally would just so I can hear that sound...especially with the top down.
The only downside to the exhaust is that it weighs just about the same as the stock exhaust. I was hoping it would be a little weight savings.
Here's a vid I shot last year with a GoPro so it's slightly distorted but gives you and idea of what it's like right at the tips.