Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Duo-fast vs. Bostich

From the sound of these reviews, the gun seems to work pretty good for homeowners & such. I've been a carpenter for 40 years. I've been using finish nailers for about 20 years. My last nail gun was a Duo-fast. I finally retired it recently, after 17+ years of service. Since the local lumber yard carries Bostich nails, I went with Bostich. I've had the gun 18 months & the piston rod has broken 3 times. Replacing it myself still cost me $35.00 a pop. Anybody who has trimmed a door or window or installed baseboard, knows it's immpossible not to hit a screw head or sheetrock nail once in a while. Well, everytime I hit one, the piston rod breaks. It breaks in the exact same spot. It appears to made of cast aluminum or something, instead of hardened or stainless steel. I like the gun & am thinking about getting somebody to manufacture a functional rod for me, since Bostich doesn't know how.