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

Input:
I bought these Koss Sportapro headphones after reading the reviews about the bass response and they are awesome!  Most of the reviews mentioned how much bass these had and they were right, there is bass in these headphones. The sportapro has more bass than my more expensive home pair of headphones.  I have owned and worn out many portable pairs of headphones in the last 20 years and these by far have the best sound quality.  I am a person who likes bass in my music listening and this is the first pair that I've actually needed to turn down the bass boost on my portable Rio Volt SP100 player.  I also have a Sony CD walkman that has a two stage dynamic bass boost, and these headphones work great with only the first stage of boost.  I could barely believe I was actually turning down the bass boost!  With all other pairs of headphones, I always needed to have the bass boost running at the maximum and it was never enough.  These headphones also have clear treble/highs and the overall sound is full.  There isn't as much midrange sound as other headphones, but if you have an equalizer on your portable cd/mp3 player, you can adjust accordingly or listen to your music without an EQ/bass boost.  These headphone have such a nice and full sound that they rival my home stereo system.  I can understand that some people might think there is an echo in these headphones, but it is no different that listening to my big speakers at home in my family room.  If you are comparing these headphones to other headphones, then yes, they have more echo, but I always like to compare headphones to my home stereo system.  I listen to music at work alot, and these are the first headphones I have ever heard that can reproduce the sound of big speakers with big woofers.  I feel like I am listening to my home stearo instead of at my cubicle at work.
As far as comfort, they fit tighter than any headphones that I have owned, but my ears are getting used to it.  If you are the kind of person who has been looking for the bass boost in headphones, but have never found it, then you need to get these headphones.  You won't believe it!

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