All right,so after almost a week of listening to my WS55,here are my thoughts on it.
BUILD:8
Very well done by AT.When I took them out of the box they felt sturdy,sturdier than my CAL!s,and the overall build is really solid.I absolutely love the look of these,so simple and sleek.One thing that could have been a bit better,but this is not too bad,is that the headband does not have any...''clicks'' to tell you at which level the headband is.That's just my personal preference though cause I prefer to know that both sides are 100% equal.It's not so bad though.Overall the build is quite nice.
COMFORT:8
Hmm..now this one is a bit tricky.When I first got them and put them on they were really comfortable,nice plushy pads sitting on the ears.It really changed my opinion about on ears because I didn't think an on ear could be this comfortable....until the first hour or so...They really clamp and when I took them off I kind of felt relieved.However,this just gets better over time.Spread them over books overnight while letting them play;making them more comfortable and burning the drivers in!After the book spread they became much more comfortable.In comparison to my old CAL!s these are a bit less comfy..although comfort was one of the CAL!s strongest points.It's kind of weird though because they almost feel like around ears;but they sit on your ears.If AT just made the earpads a bit bigger to be an around ear,these would be perfect.I kind of use these as my main headphones so even at home I use them a lot,like 5 hours or more and I do kind of have to take them off for a bit to let my ears rest after that.But if you're using them as portables say for maybe...2 hours on the go(commuting or on a break)then these should be okay.If you're thinking you're gonna be getting bose like comfort;then you're probably not going to want to get this pair.I wanted super comfort but the fun sound of these just made me toughen up and accept it...now speaking of sound.....
SOUND:9
Now..I'm not that good at describing sound, so bare with me on this one.I'm comparing the headphones to my CAL!s,which broke and that really made me a sad panda,so that means I can only go by memory and can't really make a side by side comparison.The CAL!s were bright and light,the bass was smooth but never really stood out at you.The WS55,let me tell you the bass on these oh my.It really is like the OP stated,on songs that are not so bass heavy,the bass is always present and there;but on songs that are bass centric.Oh my.You will hear how low the bass goes.After my burn in,mids and highs started to come forward.What you get in these pair of headphones is always present bass;while still hearing all the vocals and other instruments that are in the song.These headphones really bring a smile to my face whenever I hear a nice track that has nice vocals and good bass.I might be a bit biased about these headphones because since my CAL!s broke I've been using the Coby cv185(these are GREAT budget headphones by the way)for about a month;so I might just be over praising it.Still,if you like electronic music,hip hop,rap or just love bass but are like me,who started exploring other music genres as well,you will not be disappointed by these headphones.
TL;DR
+Good solid build,sleek design(unless you're looking for attention)
+Bass is omnipresent,does not drown out mids and highs
-Comfort might not be the best for everyone