I have a full Akra on my Blade and it is the sweetest thing you have ever heard ^_^ but mainly it just makes the bike perform soooo much better. Definitely worth the purchase. You can also wear ear plugs which can help, especially on the track, heaps better for concentration.
What tracks do you ride at? Been out lately?
No carpet? Has carpet? What you talkin' 'bout?
This thing moves, it's awesome. 200kW with such a light body and the Merc handling... Everything works well, the clutch is perfect, the gear box is perfect, the throttle is perfect and the breaks are great. It's just a pleasure to drive ^_^ Plus heated leather seats and hard top convertable (always a bonus). I also like the fact that you're pretty much sitting over the rear wheels, can't wait to take it to the skid pan!