Behringer has improved since they first hit the market. In the past Sweetwater wouldn't sell their stuff and now their one of the biggest dealers.
I'm guessing the weight of the Turbo systems is mostly in the wood sub/amp boxes which could be a good thing. Quality subs and bass amps are all made of wood because its more rigid so your low tones don't compromise the cabinet.
Hope theres some more reviews of the Turbosound line.