I haven't had any major issues with mine. The height adjustment is only held by tension, so it slips off over time. It has high visibility grid markers marked for a specific floor height. I just got into the habit of looking at them every time I put on a new pair of boots. I thought it was too expensive an extravagance until I bought it. It really speeds up nailing by just letting you roll as you nail. You never have to remove the nailer from the board until you are ready to install a new one. The rollers also allow you to install the nailer without worrying about damaging the finish of the finished boards.
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