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

Input:
Last year, I'd have given this product 5 stars happily.  It worked well and left just the right amount of protective coating on the metal.  I used mine religiously, and gave them as small gifts to other students at our swordsmanship school when they bought their first rapier.

Last month, I ordered several to "restock" - and all of them were nearly useless, leaving no protective coating at all even after 10+ minutes of vigorous use.  Assuming a shipping defect, I re-ordered this month and sadly discovered the same problem.  The manufacturer has changed this product, it is no longer the excellent thing it used to be.

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