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I've included a match in the photo for scale. The finished poms are 3/4" and 1". I found you can also make an intermediate size by wrapping two layers of yarn in the smaller tool.
Very little trimming is required. Larger pom-pom's aren't too difficult (although Clover's tools make it easier), but I've always had trouble getting nice round tiny poms.
I was just having fun this weekend but I think the poms will work nicely with felt as the centers of flowers or as trim. I used fingering and baby yarns for these and made all of them in a half-hour or so.