FiiO BTR15chat_bubble_outlineFrom real comments

Portability and flexibility are the BTR15's biggest strengths. Commenters repeatedly highlight its compact size as a reason to choose it even over the more powerful BTR7, with one saying they'd accept 20% less sound quality for the smaller form factor. Users appreciate running it wired or via Bluetooth with phones, PCs, and Macs, plus the PC mode that bypasses the battery to prevent degradation while charging phones separately during wired use.

Battery life and durability are recurring concerns. Multiple commenters call roughly 8 hours of battery inadequate for daily high-volume listening, citing a 2-hour charge time as impractical. Others worry about long-term battery puffing with balanced output use and the difficulty of repairs since the battery isn't easily replaceable and glass panels can crack, pushing some toward larger devices with bigger batteries instead.

Sound quality and power are solid but not class-leading. Owners praise general sound quality, the useful frequency display, and 10-band EQ, but comparisons to the BTR7 suggest it's a step below in amp performance. One tester running power-hungry headphones like the HE400se found the driving power lower than advertised, while others still find it sufficient for gaming, music, and connecting to demanding IEMs and headphones like the HD650.