I’ve been using RHA headphones for about 6 months, and I have been pleasantly surprised by their performance. The RHA 450i Earphones are definitely on my recommend to buy list. RHA recently announced that they will release premium earphones in late August.
The MA600i is made from aircraft grade aluminum, and comes with 320.1 dynamic drivers. The MA750i earphones will be made from 303F stainless steel and feature handmade 560.1 dynamic drivers. They will also support over-ear cabling for those who uses these to work out. I usually loop them around my ears, but this will be a pleasant change.
Both of these headphones have a 3-button remote and built-in microphone. They will be available on the 28th of August, through the Apple Store, for $89.95(USD) for the RHA MA600i and $129.95 for the RHA 750i.