This is yet another pair of earbuds I picked up from an electronic chain store just to get a feel of how consumer level earbuds sound this days. I am not going into detail on this one, since there really isn't much to say about it. If anything, PQ5 is more of a fashion statement than a serious earbuds. For $15 or less however, I guess you can't really expect much from Sony.
Basically this is a very warm sounding earbuds. Bass is decently bodied but lacks a touch of speed. Mid is full and forward but often get overly thick especially when a little bass is called for. Treble rolls off early and feel overshadowed by the thickness of the mid and bass.
Overall, PQ5 isn't a bad earbud for the asking price. But then again there are much better Sennheiser's options if you add a little more than $10 to the price tag.
See Earbuds Round-up for ranking.