Bpandbass has posted a comparison review of the Mojo and HA-2SE. Click on the link below to see how each faired.
Sophonax has a review of the OPPO PM-1 headphones on Head-Fi.
Pros: Clean, clear, and warm sound; forward midrange; good bass extension; non-fatiguing treble; outstanding build quality; great overall design
Cons: Slight lack of treble extension; heavier than most dynamic ‘phones; a little pricey
Army-Firedawg has posted a nice review of the OPPO PM-2. The view is that the PM-2 is identical to its bigger $400 more expensive brother. What it lacks is snazzier looks and some pads. But for a 30% discount this might be the right decision.