Instruct: Classify a given Amazon review as either positive or negative.
Query: THE LONGER YOU HAVE IT THE WORSE IT GETS!!

BOUGHT THE FIRST ONE [PART OF A 2 FOR $99.00 DEAL]ON 03/01/07 IT WAS USED ABOUT 10 TIMES A YEAR WITH GREAT RESULTS!! HOWEVER AS TIMES WENT ON THE KNIFE STARTED TO LOSE POWER. AFTER THAT, THE KNIFE WOULD NOT CUT BUTTER. I CONTACTED SONIC BLADE BUT NO RESPONSE AFTER 6 EMAILS, AND NO ACTION WITH THE 5 PHONE CALLS. THE OTHER SONIC BLADE WAS GIVEN TO A FRIEND AND WAS THROWN AWAY WITHIN A YEAR DUE TO NO BATTERY LIFE. BOUGHT ANOTHER ONE IN 01/01/09 THIS ONE WAS WORSE AS OF THIS LETTER 01/30/10 IT IS DEAD!! WHEN IT WORKED IT WAS GREAT,HOWEVER IT NOW IS WORTHLESS. I EMAILED SONIC BLADE LAST WEEK ABOUT BOTH UNITS, GUESS WHAT?? NO RESPONSE!! I EVEN HAVE HELD ONTO BOTH UNITS IN CASE OF A RETURN DEAL,BUT I THINK I WAS TAKEN AGAIN. SAVE YOUR MONEY UNTIL A RELIABLE CORDLESS KNIFE COMES OUT. AFTER SOME RESEARCH ONLINE THERE ARE NO CORDLESS KNIVES OF VALUE. IF YOU ARE A INVENTOR THIS WOULD BE A GREAT PRODUCT TO START WITH!!