General Krell demonstrates in Star Wars: The Clone Wars that the use of two saberstaffs is plausible:
However, is it advantageous in battle, as opposed to dual lightsabers or a single saberstaff?
Science Fiction & Fantasy Stack Exchange is a question and answer site for science fiction and fantasy enthusiasts. It only takes a minute to sign up.Sign up to join this community
As discussed in this answer, dual lightsabers limit your balance and movement. Additionally, your mind must focus on more objects, something even a force-user will find more difficult than using a single lightsaber. Additionally, when you swing a double-bladed lightsaber, you have to be constantly aware of where the other blade is to avoid cutting your own limbs. This is going to limit the range of motion of your attacks and defenses. While it may look cool, using dual dual-bladed lightsabers is not very practical.
This is far from practical. The reason that General Krell was able to wield dual saberstaves was because he had four arms. It requires two arms to wield a saberstaff effectively, watch the episode where the clones arrested him. So unless you have two bonus arms . . . Also, for those arguing even Krells ability to wield them, this is a fictional universe, and he was a Jedi. Force-sensitives can do a lot most normal people can't.