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I bought this Nitek Duo second hand, and it had been doing great for a while, and I was very happy using it.  But on a surface interval the display started to go, had to hold it at a sharp angle to even see anything.  I had the luxury of another computer, so I took the nitek along on the next dive, and in the middle it went into surface mode, and a few hours later it went dead altogether (if anyone wants all the gory details please PM me).
So I contacted DiveRite and got a rma number, and sent the beast in, and they replaced it free of charge.  Even had quick turnaround time.  So, a happy experience with a manufacturer!

Nice to hear good news for a change. I've always heard that Dive Rite has good customer service. I am waiting to hear from Scubapro about my Uwatec computer. Wish me luck! ;D

Ya, I sent at Dive Rite tank checker back this year because it was way off. If was a few years old. They exchanged it for half the cost of new.  I was happy...

But I've had pretty good luck with most dive manufactures O"Neil replace a dry suit I purchased as a "Blem" that was 4 years old with a brand new suit about 13 years ago. I never even spoke to anyone, just sent it in with a letter and two weeks later I had a new dry suit at my door. Underwater Kinetics has replaced stuff for me before too.