I love ALL the Sew Line pencils - you wouldn't believe the stack of marking things I have that don't work, but Sew Line pencils are great.
I only use bias bars when I don't have a "close enough" size in the Clover bias tape folders. Those are so easy and you can "fudge" with them a little to make the tape wider than it is at the exit point of the folder. Just don't press the folded tape as soon as it comes out of the folder - hold the iron a couple of inches away. The bias bars work fine, but they're hard to get a nice sharp edge on them, as you can with the bias tape folders.
