Pros: Amazing soundstage, extremely comfortable, Outstanding sound quality
Cons: Come with 6.3mm jack plug but you end up using them with 3.5mm adapter most of the time
Note: This is my first audiophile headphones so i can't compare them to any other headphones out there for the same price.
These headphones are well designed, fit your head perfectly and are extremely lightweight. They are made out of plastic but they don't look cheap. They are very solid in my opinion.
You can wear these for a long session and never worry about them.
This is the first reason i decided to buy these.
About the color. You may or may not like it. I love the color combination, they look classy but it's all about personal taste. Since they sound so great you'll forgot about the color soon enough after wearing them.
Second reason, probably the most important, is the sound quality.
I was looking for open headphones. The soundstage you get from that kind of headphones can't be replicated by another. The HD 598 soundstage is amazing. Period.
They sound leak a lot but this is intended and make them sound phenomenal in terms of soundtage. If you plan to use use them for personal listening at home or in a quiet place you shouldn't worry about that. (By the way these are sold for home listening so if you buy them and complain about the sound leak, that's just stupid).
Out of the box they sound good but i noticed an improvement with each hour of listening.
The sound quality in general is amazing and changed the way i enjoy music. These headphones work well with different musical genres. I listen a lot of folk, jazz, blues, funk, rock but i tried almost everything with them (even electronic which is my least favourite genre) and they never failed me.
If i had to describe how they sound i would say "smooth and extremely clear". You can ear every single instruments even when there are tons of instruments.
I love vocals and these headphones make them shine. I almost cried listening to some songs posted in the "best female vocals" in forum music section.
In a word, they are accurate.
Being so precise i noticed the sound source has to be right to enjoy these headphones to their full potential. You can easily spot the difference if a song is not well mastered or comes in poor quality (song's format matters).
An amp is not needed in my opinion but could be useful.
I tried them with my pc and an ipod. They sound different on my ipod and not so great. I wouldn't recommend them if you plan to use them only with an ipod or a dap in general. And you shouldn't as i mentioned early these work wonder if you use them for house listening.
About the lack of bass response someone point out in some reviews. That's not true. The bass is there how he should be. It's not emphatized compared to some headphones out there.
I found almost no cons. My only complain is about the cord: it ends with the larger 6.3mm plug but i use the 3.5mm plug most of the time. However the cord is detachable so you can replace it easily so it's a minor con.
In conclusion, these are quality headphones. Sennheiser quality. You won't regret your purchase and you'll start to enjoy music even more.
I give them 4.5/5 stars even if they are perfect for my needs and they are one of my best purchase ever.
I would strongly recommend them to anyone who want a great pair of headphones without paying much. I look forward to use them everyday.
Note: this is my first review and my english is not so good. Sorry about that. I hope this could be useful to someone. I'll add some pics as soon as possible