Instruction: Analyze the user's review text and determine the overall sentiment expressed, then choose the corresponding sentiment option from the provided list (A: very positive, B: positive, C: neutral, D: negative, E: very negative) based on the identified sentiment.

Input:
After charging the Rio 800 and calibrating the battery (an annoying 5 hour process), I spent a fair amount of time trying to figure out how to load songs on to it. This is mainly a fault of the instructions, once you get the hang of it, the software isn't that bad.
The product was great for about an hour. Then, it shut down for no apparent reason. Even with the adapter plugged in, it won't power up. Trying to get through on their customer service line is next to impossible. This thing is a complete waste of money.
After I returned it, I bought an Intel Pocket Concert.  Its a little more expensive and doesn't come with as many accessories, but it has worked every time I've used it and I'm much happier with the purchase.

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