Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Initially great-currently disappointing

As others have stated, out of the box this phone system was great. I experienced superior sound quality and acceptable range (no problems inside or outside 4 bedroom colonial on .75 acres). After 2 years of use most of the handsets have developed an annoying garbled interference that begins shortly after using the phone. This makes it impossible to talk and leaves you scrambling for another phone. Siemens support has been disappointing. I have 4 handsets and only one works correctly. Despite my initial enthusiasm with the system-I will not buy another Siemens product.