I've had my BLONs BL-03 for around 5 months now, I bought them mostly because of the hype surrounding them and I always thought there was something missing in the sound. When I pair them with my Snapdragon Galaxy S9 the sound is just ok, maybe kind of anemic for me, nothing really special. The pairing with my LG V30 is way better but they often sound a bit brighter and fatiguing for my taste and that's probably due to the sound signature of the V30.
Some days ago I bought a Cowon Plenue 2 and yesterday I was listening through my reference IEMs and I avoided the BLONs thinking they would sound bright again or something similar. Oh boy I was wrong, I think the Cowon unleashes the full potential of the BL-03 with some help of the Jet Effects of course. Now I'm hearing a smoother, a bit warmer BL-03 but with lots of detail, the separation and imaging is also very good. I'm loving this pairing and the BL03s now. I guess they're source dependant but I'm glad I bought the Cowon P2 and the BLONs.
Yep BLON BL-03 scales better with amping, and I find the bass tightens too with amping.
Though I had a friend ask me why I'm using a more expensive amp (source) than the IEM (BLON BL-03) itself haha. So I guess he has a point there, but well different strokes for different folks.