I have a CF Boomstick on my Midnight Ego 11 and really like it. It is way overpriced, but it shoots very well, is quite, and looks awesome. Also, I am a complete sucker for anything carbon fiber.
In the end, it is your money and you can do what you want with it. If you like it, then I would recommend one as long as you don't have to eat ramen noodles for a month in order to afford one. If you don't have enough cash, just get the Ultralite. Works just as well and is cheaper. Just doesn't have the cool carbon fiber.
If you really want carbon fiber, but can't afford the CF Boomstick, then there is always the Deadlywind Fibur Barrel. I have one of those as well and it is very nice and, since it takes the freak inserts, it is very versatile.
One nice thing about the CF Boomsticks is ANS has them with a variety of tip colors now, so you can match your gun. Mine has the dust black tip to match the PE Midnight color scheme.
Here are a couple pics of mine: