No, it's the HF3, which I actually enjoyed more than the ER4 when I had the ER4s. Of course, I owned the ER4Bs, which I've heard are very hit or miss (they have a very annoying treble spike that I really couldn't stand; never understood sibilance until I heard them). I'll try to do a W4R/GR10/F111 comparison this weekend. Currently, I think the F111 is the keeper, but the others have a lot of merits too. The HF3 has been with me for a really long time and with it's absolutely perfect fit, great price, and very decent sound, I don't see myself selling them in the near future at all.