Instruction: Given the user's review, identify the user's sentiment from the listed options. Answer using one of the options.

Input:
I purchased this product.  It worked great for 2 weeks then started flashing USB.  Nothing would play and unit would not even turn off!  I have been talking with tech support for 2 months now, they gave me horrible directions for fixing it, it only make the problem worse and/or corrupted some files on my PC so that I had to delete/reinstall everything (I am A+ Computer Certified, so yes, I know what I'm doing).  Each email to tech support takes at least 5-7 days to respond.  My unit was sent back over a month ago and I still do not have  a replacement (They make you pay for shipping charges for the new unit as well!)  I would not recommend this product based on other reviews as well as my own experiences with their tech support.  One plus, the included headphones have a great sound to them.

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