Yes I listen to J-Pop/J-Rock pretty regularly actually, and I've been listening to it for about 5 or 6 years now. I've got a bit of an Japan obsession I guess you could say.
for J-ROck, I love Yellow Monkey, X Japan, Dir en Grey, L'arc~enciel (spelling), Go!Go!7188 (I only heard one of their songs and I like it. Need to listen to their other songs)