Instruction: Carefully assess the user's review for any strong expressions of sentiment, either positive or negative. Based on your analysis, select the most fitting sentiment option from the provided list as output.

Input:
My unit has a constant high pitched buzz that makes it intolerable. In my case, I don't believe it is coil whine as others have stated because it is not load dependant. As soon as I plugged it into the wall it began buzzing. I've tested it on every outlet in my house with the same results. My Tripp Lite TLM626 surge protectors are dead quiet on the same outlets.

*Updated 08/14/13: Amazon had a replacement sent out to me asap. They also don't charge to ship it back to them by including a prepaid UPS label. The new unit works exactly as desired. Tripp Lite seems to be having some issues with Quality Control, Amazon on the other hand is stellar as always.

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: B: positive