I own the HP4 and it's perfect...pristine/clear sound quality, plenty of power, and has stayed on 24/7 since last Christmas without any problems. Not sure how similar the 2 are but just thought I'd say anyway.
I'v used the hp60 a fair bit... It's great!! What I do is run 6 outs from my firepod into the 60 external stereo in's on the hp60, giving each person a seperate headphone mix of whatever they like! It's good!
