Nothing beats it. It's essentially a ranged arc blade. You get an over shield, and can use it at further ranges, making it much more difficult to go up against. With blade dancer, it was just a shotgun and melee. Can't do that to people in storm trance. They get you from further range, because warlocks of course get it easy becuase they require no skill. Hell, even sunbreaker takes more skill than stormtrance.
Edit: we passed 300 replies!
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Sunbreaker is literally a ranged arc blade. It's like some guy went to bladedancer class, got bored, and strapped explosives to his arc blade and started throwing them around.