Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Quality Problems Clobber a Good Idea

I received two of these from Radio Shack for my birthday. One had no power supply and had to be returned to the manufacturer for replacement. The second became intermittent after about 8 months and is currently being replaced under warranty. When it worked, I loved the functionality. Now that it is not working, I get irritated every time the phone rings and I'm reminded that it quit working.I received two more of these from Sharper Image for Christmas. One self-destructed within 24 hours of being put into service. The second has yet to be installed as I decide whether it is worth the effort. Also, they have shortened the warranty period from 1 year to 90 days. This is a clear sign that they know they have design problems and are cutting their losses.So if you like this product, be prepared to replace it often. I'm hoping someone else will make a more reliable model.