the panasonic is a total fotm. it is decent for the price, has nice bass, but the mids and highs seem small compared to a sony v6 or a shure srh440.
for a closed headphone also consider jvc harx700 or 900.
the sony is the best all-rounder, the shure is more studio/enthusiest oriented, the jvcs and the panasonic are 'fun'.
are u a gamer? then i would get the jvc harx900. audio purist? get the shure. basshead? panasonic or jvcs
all round best- the sony v6
the sony xb700 is also a big fluffy bassheads can. recessed in the high end tho