I have the Clover mini iron with a few attachments. I bought the 'new' design (as the package says) that has an additional safety factor built in to the design.
Well, let me tell you that I obviously am not bright enough to use this mini iron. First time I plugged it in, I thought to myself, "Now DON'T touch it here, or you'll get burned!"
So who knows the end of this story? Yup, I grabbed the mini iron in the ONLY place you're not supposed to grab it, and burned the heck out of my fingers.
I can't tell you if it is good for seams or not, because I unplugged it, put it away, and probably will never plug it in again until I feel like I have developed enough of an IQ to use it without causing great pain to myself.