I never ''owned'' the RS1. This was in 2006, I was looking to buy a quality extension cord for my HD600, and I heard that Grado made one, so I went to this autorized Grado and Sennheiser dealer who had it in stock.
Once in the store, I asked if I could listen to the RS1, and since they also had the HD600, I figured why not compare the two. It was then that my jaw dropped when I saw how much detail I was missing with my HD600.
Funny story, sort of, this is the same dealer were I had gone to a few years later to buy a cartridge and a felt mat for my Technics SL1200 MK2, and ended up brigning back a pair of mint HP1000 that they were selling for a good client of theirs, for $350, I was so exited, that I forgot about the mat, and left.
The whole HP1000 story goes like this. At the time, I didn't know how rare and well regarded the HP1000 were, it's only after doing a little research, later the day that i bought my cartridge, that I found out how much they were selling for. I'll never forget the look on that poor salesmen face when I informed him that he could've bought them straight from his client and turn a big profit. The story doesn't say if he informed the client (an elderly gentlemen) of the actual value of his headphones, I hope he didn't, poor man, it's enough to give him a heart attack.