I've run them for the past couple of years. Overall, it depends on the type of match/shooting you're doing. PRS, pistol, indoors, ROing, or anywhere you will see a lot of brakes, then I double up or go muffs. NRL, team snipers, etc, where you're not near the shooter, then I run the Decibullz plugs, plus I'm about 100% suppressed nowadays. I find that they start bothering me after 8 hours.
Based on the environment you describe and if you shoot with a brake, then stick with the headsets. I would only go Decibulls if you're suppressed.