I'm with Bueniebabe, I bought the Clover seam ripper with the round handle (the brown handle one is a dud). It's the sharpest and has the smallest "blade" to get under the smallest seam. Haven't had a problem with it getting dull. After doing the search and swear several times I went to the Clover website and purchased 5 more. I can now find one (or two) before I reach frustration level. Since I can manage to poke or cut holes in my work I'm afraid to try using my rotary cutter, thread snips or scalpel.