Yeah, I have the HD 590s from about eight years ago when I bought them, and they are still ridiculously amazing. I've tried the 595s and they are almost identical in sound quality, but they certainly look nicer.
I can't speak for the 555s personally, but I have no doubt they are quite good (from reading reviews and my general experience with Sennheiser). One thing worthy of note is that these and the 595s are open-aire headphones. Meaning they are NOT good at blocking out external sounds. That said, I still listen to my Sennheiser HD590s on the bus quite often without problems, but it's much harder to hear and appreciate their quality if you're consistently using them in such loud environments.
Edit: Wow I was fucking retarded. Perhaps I should read the whole thread next time before I post. Glad you're enjoying them .
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