Arrived this morning (http://i.imgur.com/luZJIoY.jpg) Can't post pictures directly, sorry.
Living in China so bought them direct from Xiaomi for 149RMB ($21.50US)
My current daily driver is the previous iteration, the Hybrid, 'HD Audio' etc original 'In-Ear Headphones Pro'. The previous Pro had amazing bass, but was a little muddy throughout pretty much all mids and highs. Made it easy to listen to music at very high volumes because everything sounded pretty soft through them.
The new Pro HD is definitely much clearer, with way better mids and highs, but it has far less bass. I find myself turning songs down because the highs are so clear/sharp that it is a little painful at full volume. There are a couple of chillstep tracks where the bass goes so low that the earphones can't handle it, and it makes a rattling/static noise as it struggles to reproduce the sound. This is at full volume with bass boost, so it's not totally unforgivable - but it's a limit I never reached with the old ones. Switching them out and hearing the old ones play a song where the new, more expensive ones, can't is a shame.
Ultimately, I don't think they're better than the previous Pros, just different. The previous ones are much better for jamming at high volumes, and listening to bass-heavy music like dubstep and some electronic stuff. The new Pro HD is great for movies, acoustic guitar, games etc because of the higher clarity.
Given that they're 50% more expensive, (99RMB vs 149RMB) I feel a little disappointed because I do tend to listen to very bassy music. For those who like the clean sound, they'll definitely appreciate them more. Still an incredible pair of earphones for $20.