It's quite a bit more than a stock phone adapter (46 USD vs 10-15 USD), but still a lot less than, say, a Dragonfly Red (200 USD). And far more compact than the latter.

I have the Sonata paired with some 30 GBP Chi-Fi earphones in my walking-around bag, and a Dragonfly Red paired with some 130 GBP Chi-Fi earphones in my cycling bag. The bike bag can afford to carry the bulkier equipment!

Now i just need to get a motorbike or something, so i can logically justify buying a Dragonfly Cobalt and some really nice earphones ...