Placed my order on a used-like new RE-400 on amazon for 89 dollars, no tax free shipping. Will write a very short comparison to the HE-400. My current Skullcandy Holua pisses me off and Apple buds don't provide isolation.
I know it's a weird comparison but they two are somewhat relatable. I think it'll be interesting how Hifiman will translate their house sound from entry full-size planar to entry IEM.
I own the he and re 400. They are very very different. The re has more forward mids, a lot less bass, and somewhat recessed treble in comparison to the he400. But, for on the go, at the price they're at, they an amazing compliment to the he400. it takes a while when switching between the two to get used to the sound of each, but I really enjoy the re400. Do yourself a favor and buy the comply ts400 tips or make some diy ones from earplugs. I've used both and they are each better in isolation and sound than the stock tips, for me at least.