What's your oppinion on bridging two channel amps?

I've been reading on the web about bridging two channel amps and it seems that some people believe it isn't a benefit. I've noticed that most manufacturers say that you should only use an 8 ohm speaker when bridging, but don't most speakers dip below 8 ohms? It probably varies from amp to amp on the benefits, but I was looking into purchasing a rotel rb980bx to use for a center channel amp and it has the capability to be bridged but some people said the sound was worse, just louder. What do you think about bridging my classe ca-150 for center channel duties and using a b&k st125.2 for front right and left channels? Thanks guys!

P.S. one of these days I'll quit posting new threads all the time, it's just that I know you guys (and gals) are experts. I really appreciate all the help and knowledge I've obtained from everyone out there. I'd be so much further behind if it weren't for you. Thanks.