I tried it but decided to get the Havok instead. The Boomerang looked kinda funny because it is not symetrical. One side is flat so you can mount a camera. It feels claustrophobic. On the plus side, it is very low profile.
I jumped the Havok last year at the WFFC, it was nice. Good Vis, quiet, however, its out of my price range taking into account the exchange rate and duties and taxes. I looked at the boomerang on the net, only pictures where taken from one side, did't know that the other side was flat. Went with the Factory Diver anyway.