He's only in the Vector storyline, wherein he does get Vader (pretty soon post-O66) worried that using his power to take on Sidious would be trading one master for another, and he takes on Darth Krayt in a force duel, so we've got two big badasses as a reference point. While the duel's interrupted, his ability to not just use forcelightning, but absorb his opponents and toss it back at the same time is pretty scary.
Though he's limited to Vector, we do get his rival, Baron Dreypa, in the Lost Tribe of the Sith comic. Wherein Dreypa pretty much makes a planet full of sith crap themselves.