I like the R2Cs a lot. The car was definitely louder, especially above 5k rpm. I actually ordered the black powder coated ones, but received the black chrome, which look really nice. Filters are nice and large and can be cleaned with an air hose when needed. As discussed before, no idea if there were any gains over the stock intake. Installation took me 2 hours or so. I made a little video last year as well:
YouTube - R2C Intake installed on 370Z