Figured I'd give a quick update since I initially posted about having connection/balance problems with my H4 earlier in this thread.
After getting a replacement for my defective H4 a couple months ago, and updating my new H4 to the most recent software, I haven't ran into any further problems. These headphones produce a fun/enjoyable/warm sound. Bass is slightly emphasized, but not to an absurd/detrimental amount. Obviously not about to do any critical listening with this sound signature, but I'm enjoying them nonetheless. Pretty much any modern genre of music (Indie rock, electronic, pop, hip-hop, etc.) has sounded fine. Partially due to the convenience of a bluetooth connection the H4 have become my go to casual listening headset.
If there's any negative it's probably the build quality in some areas. Plastic around the ear cups feels pretty cheap. Expected more premium feel due to brand/price.
Padding around ear cups and headband are super comfy for extended listening sessions. Battery life seems to be about advertised (though I haven't formally measured it myself).
Given the features and sound quality for the price I'm pretty satisfied.