Task: Sentiment_Analysis

system
You are a helpful assistant. The assistant first thinks about the reasoning process in the mind by using Belief-Desire-Intention (BDI) framework and then provides the user with the answer. The reasoning process and answer are enclosed within <think> </think> and <answer> </answer> tags, respectively. 
Below is an instruction that describes a task. After thinking, when you finally reach a conclusion based on the customer's intention, desire and belief, clearly state the BDI thinking process within <think> </think> and then the answer within <answer> </answer> tags.


user 
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:
User Review: I am a new addict to the world of higher end home audio.  At home, I have a Rotel 1070 integrated amp and a set of Vanderstein 2 CE Signature speakers.  But before I could afford this, my passion for audio was quenched by headphones.  You really get about 10x's the cost effectiveness by going the headphone route.  I've owned about 15 sets in my lifetime not including the crappy ones that came with my portable mp3/cd players.  The good ones I've owned are a myriad of Sony full-size, Grado SR-80's, and 4 pairs of Sennheisers.  The high end Sennheiser 600's, the midrange Sennheiser 497, the portable Sennheisser PX-100, and now, the MX-500's.

Of all of my headphones, I am most impressed with the Sennheiser 600's for their EXACT sound.  However, bad recordings sound horrible, MP3's are unlistenable on these headphones due to the corruption of mp3 compression.  My second choice is these MX-500's.  I'm not saying that they sound better than the the others in my collection, but it's close enough.  More importantly, they're comfortable, portable, and forgiving.

First the bad:  The MX-500's have horrible bass compared to headphones, and is on the lower half of good earbuds.  Any Sony Fontopia's with their Turbo bass circuits will blow these out of the water in terms of bass.  Hip-Hop booty music, techno, and dance music all seem to lack something with these headphones.  There is simply no thumb.  These earbuds don't even attempt to hit any notes in the lowest region.  If there's a 30 Hz signal, it will simply be inaudible on these.  Bass Guitar even sounds slightly muted.  The cord is a bit short at 3 feet.  And the plug is L shaped as opposed to the straight plug.  When the cord is so short, that extra inch actually matters.  And at first glance, the build quality of the actual plastic ear pieces feel a bit cheap compared to the higher end Fontopias (the one with the velvety texture).

The Good is GREAT!  Imaging is outstanding.  The soundstage is very upfront; you are in the front row of the stage.  These earbuds make voices sound amazing.  While most earbuds make words sound very abrupt and cut off, these earbuds make the voices roll off so gradually.  Imagine hearing a sweet wisper of someone singing in your ear - You know the sound when people go from one word to another?  Those sweet aspirations of air that comes with the ups and downs of each word in a sentence?  When I close my eyes, it feels like my ears ARE the microphone in a soundproof studio with the artist. To top off the sound there is an ingenius volume control that somehow is immune to accidental touch.  And for $13 dollars?  My fontopias were $60 and they don't beat these.  I'd even take these over the very uncomfortable Sennheiser HD 497's straight up.  I bought two just for myself.  That's how happy I am with them.

UPDATE:
I've also recently purchased the Sennheiser MX550s.  Comparing the two, I'd say the 550's sound more like fontopias.  More range, but lack that smooth midrange.  The build quality on the MX550's is slightly better using a metal grill cover instead of the plastic.  Notable also is the I shaped connector instead of the L shaped connector.  The included case on the MX550 is designed poorly, the mechanism to roll and unroll the cord simply doesn't work.  The MX550s are also much easier to drive.  The MX550's play much louder at the same volume setting.  But for $25 dollars, they're only marginally better than the 500's, but in some ways worse (sonically speaking).  Save yourself the money and get the MX500's.

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


assistant
Answer: A: very positive