Just picked up the WS55 for use on my portable gear while commuting, out and about, etc. I paid about AU$90 shipped and plan to use them directly out of an iPhone and iPod, unamped. I'm super satisfied with them for their sound quality vs size and price. The bass is really tight and punchy, and doesn't drown out the other frequencies at all. I expected them to be a little bit muddy, especially because of the powerful bass (which extends lower than I expected it to, to my surprise), but they're really not muddy at all. They're very clear and the tonal separation is very good for headphones of this type, which makes them fantastic for lots of different genres of music.
The construction is decent for their price, nothing mind blowing but certainly adequate, a little bit plastic-y, but nice and light for portable use. Their look and style is phenomenal. Love the red colour (as other have said, it's a true red and doesn't look pink at all). They look nice and compact while being worn, and the cable is a good length, quite thick, and tangle-free. I'm usually fussy when it comes to on-ear headphones but haven't had any major comfort issues with these that couldn't be fixed with a bit of adjustment. They have a fair amount of clamp, but I've definitely experienced much worse, and it's something that will improve with wear and use.
The only real negative I have for the WS55 is that they have that slight boxy sound that most closed headphones share, that you can notice mostly on vocals and airy instruments. It's not really the fault of the headphones though, but rather a result of the type of headphones that they are and is to be expected (keep in mind I mostly use open full-size headphones, so I possibly notice this a bit more than most).
Overall, I'm extremely happy with the WS55. I expected them to be good, but they really surprised me with just how good they are. If you're in the market for a closed portable supra-aural headphone, at under $100 these are a bargain and shouldn't be overlooked.