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the negative side to brackets is they make your camera + lights huge and obnoxious to carry around.
I can sling a SLR over my neck and shoulder with a speedlight attached and be ok. I can't do the same with a bracket- you'll get snagged on stuff, people and doorways.
The cheapo stuff from Tiffen (it was once a big deal brand, but I forgot the name) works fine, just use blue locktite on any threads for mounting plates or flash brackets.
Ultra expensive brackets make no sense to me as they're just going to get beat to hell and even if they flex a bit, they're still less shaky than you are. I'm going to guess you're not using a flash bracket on a tripod either for event photography.