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They are not bad just creepy. If you have a lot of them that means your feeding too much . If you just have one or two they will be a good addition to your clean up crew. You can get a trap for them if you really wanted it gone.
They are absolutely a great addition to your clean up crew! However, if you see that they are getting too big, they have traps at you LFS or you can use tweezers to remove them from the tank when they come out after dark!
Bristle worms may be nasty looking but not something I'd work at eliminating. Well, as long as they stay small!
Good clean up critter as others have mentioned.