Pros: Good isolation, smooth sound, light weight
Cons: Large earpieces, wind noise, real lack of treble extension and sense of space
Here is my video review of the XBA-H1. If you like the video please check out my channel :) Below the video is a quick summary of my opinions.
Design & Comfort
The XBA-H1's earpieces are quite large, and may not suit every user's ears. Thankfully they are quite lightweight. The cable is good quality and doesn't tangle easily, and microphonics / cable noise is reasonable even when worn down. Isolation is good, but with the large earpieces wind noise can be a problem. Given the large size of the earphone, Sony should perhaps had gone for a negative profile design.
The H1 does really sound as if someone took a XBA-1/10/C10 driver and added a bass driver to it. You get the same feathery, brittle kind of sound of the XBA full range driver now combined with a dramatically more thumpy bass line. As a result the earphone is very thick and smooth in sound, and has a similar character to the Shure SE215. However, the addition of the dynamic driver means that treble, which already lacked extension in the XBA-1 series, now really ends up taking a backseat. The lack of treble extension means that strings and vocals sound blunted, feathery and brittle, and there is a real lack of air in the sound. The Shure SE215 in comparison has a much more natural high frequency roll-off and overall I think sounds better.
Given that the SE215 has a negative profile fit, detachable cables, a more natural sound and a lower price, I would not really look at the H1 unless I was absolutely allergic to high frequencies.