Well, i did it joseph,as promised, i have tryed the L-cush with my SR80i, and i have to agree that they take the SR80i to a whole other level, so much so in fact, that i'm thinking about selling my PS1000, just kidding of course, or am i.
The first thing i noticed was that i was hearing more details than with the comfies, also, i've foond the bass to be tighter, and the soundstage is bigger, so exept for comfort when i'm wearing my glasses, it's all good.
I don't understand why Grado even bothers with the S-cush, i mean, the difference is anything but subtle. I feel like an idiot knowing that i already had the L-cush, and never bothered to try them with my SR80i, oh well!, better late than never, i guess.
I have always said that i could be happy with my SR80i as my only pair of headphones, and now, with the L-cush, the compromise would be that much smaller.