Late joining in, but it really is a nice thread. My first real experience with headphones would have come back in the 1980s with some mid-tier Sony closed back design my older brother had purchased. We had a decent Pioneer SX 580 receiver and a PL 200 turntable back then. I loved listening to music through speakers, but at one point I started listening to music for hours late at night through those Sony headphones. I remember they sounded good, good enough that I wanted to keep them on my ears for hours at a time. We had a big faux leather rocking recliner which I would of course rock in while listening to music pretty darn loud, albums like Hemispheres and A Farwell To Kings by Rush, Black Sabbath the Mob Rules, Van Halen - Women and Children First, Saga - Intransit and so many others. It would be many years later that I re-discovered my love of headphones. One day I just decided I really wanted to listen to headphones again so I started researching headphones and I came across a site in the UK where they were big on the Grado sound. I liked the idea of supporting a US company, and a smaller one at that, plus I was really intrigued by the idea of an open-backed headphone.
I searched around here in Ottawa for a retailer and I found a store selling a few lines including Grado, which they were no longer keeping because the Canadian distributor would not improve their margins. The store was replacing the Grado line with Ultrasones and I spent a few hours comparing the two companies. I walked out of there with their last pair of SR125s, which I just loved. I sold those to a friend of mine a few years later so that I could purchase some SR225s. Anyway, like you David, and many others the Grado sound really drew me into this hobby. I have since moved past the Grado sound (not for good mind you, I still would like to try another Grado can, I also had an HF2 for about a year). If I had a wish it would be for a Grado can that learned a little from the HD 650 in terms of being a little more smooth in their vocing, while retaining much of the Grado forward sound yet getting the highs and upper mids under a tighter, but present sound. I would also like to hear a bit more bass quantity. I always liked how articulate the bass was on my HF2, but still felt the need for more of that bass.