Exchange them for what, is the question. I bought the SHE3595 yesterday (mic'd version of the 3590) and it has been noticeably cheapened over the 3580, mic'd or not mic'd (I have both versions of the 3580). The housing's shell's polish is scuffed (well, maybe not scuffed, so much as the finish of the whole housing being less glossy than the 3580), the brand lettering is pre-worn-out (like silkscreened lettering coming off on old phones, except these are new), and (most importantly) when I put them on the sound is noticeably skewed to one side. Unless I happen to have got a dud, or the non-mic'd 3590 are somehow better than the mic'd 3595, I would not recommend getting the 3590 in lieu of the 3580. I have bought a mic'd 3580 and, like, 8 or 9 copies of the non-mic'd 3580 and have never seen anything like it.
I'm glad I didn't buy them now. They were cheaper so I didn't know if they were the next model year or the next model down. It sucks when someone has a good product and then they mess with it. I guess I'd be exchanging for the XF101s, then, if I exchange. With the extra bass though, they seem more suited to electronic stuff and not the classic rock or classical I'd be listening to. I like deep bass, but boomy bass bothers me.
Just as a point of reference, I found the PX100s to have a bit too much bass and too rolled off on the treble (but good sound in general). I have a pair of DT880s which I love for classical and are ok for rock, but want to build a Bottlehead Crack to tame some of the treble and then eventually pick up the DT990 (or the Tesla's, but I just don't think I can justify the price tag on a government salary) just for certain types of music that sound too sterile on the 880s.
I'm using an Onkyo SS on them now, and would have already owned a DarkVoice if I hadn't heard good things about Bottlehead Crack and have been waiting until I'm in a better condition medically to build it. I guess I could have always selected the factory option, but that seemed like taking away half the fun and then I wouldn't have clue how to do the upgrade if I ever wanted it.
Back to these 8000s, they seem to have mixed reviews online, but I'm always leary (sp) of reviews from other sites because people don't realize you need to burn in headphones and fit them properly. Some people say they are great and have deep bass, others say they are lackluster. The sales girl at Sears said she has the Philips sports version and really likes them.
I'm gonna take the X5L with me since I don't care if it disappears, I'll just buy a new Cowon (I still really like it so I'd rather it not be stolen, but its old enough that I've been thinking of upgrading for a while). Plus the battery lasts forever. I was thinking about performing surgery on it and putting a 64 GB card in it, but I don't think I should take a chance of screwing it up this close to when I need it. Plus if I screw up performing surgery on my electronics, I think its a bad omen before having major chest surgery performed.
Anyway, I'll probably burn in these SHE8000s for a day and then let you know what I think, unless someone has a better option I can get locally.