If you're looking for earbuds that delivers flawless performance across the board with a smooth and relaxed immersive signature, then look no further! Just make sure to pair it with a reference source with good power to get the best out of it.
If you're looking for an earbud with great soundstage, powerful bass with great rumble, full bodied mids with beautiful vocals and smooth yet energetic and refined treble then the Penon BS1 definitely should be on your list especially at its price point!
I can only praise Astrotec for the Lyra Collection build quality which is just top notch, this includes a surprisingly well built 4 wire cable with no microphonics, smart over ears fit, and a really audiophile tuning with strong technical foundations while remaining smooth. Astrotec clearly stayed off the usual warm, bassy with boosted lower mids on top tuning of most earbuds.