I purchased an ACOM 1200s amplifier in January. The amp was great and worked fine until it died in August. I sent it back to DXEngineering's repair department. After many attempts to repair it (all in communication with Bulgaria) it resisted repair. Finally ACOM requested the Amp be sent back to Bulgaria for repair. I then contacted DXEngineering and they have replaced the unit with a band new unit. The folks at DXEngineering were very understanding and friendly. I would certainly do business with them again. BTW the new amp is performing wonderfully.