Were any of the other Blons worth trying? I could've lived with the 03 if it wasn't for the 8k peak, I see others have more emphasis around 5k that I think might balance it out.
BL-03 is the best of the lot IMO and the one that brought BLON to the map. Harmanish with midbass bump, pleasant tonality, very analoguish and good timbre, but absolutely crap in technicalities. The BL-03 is infamous for a horrendous fit due to a too short nozzle. So most folk need to spend a bit more to get longer nozzle eartips and this adds to costs. There isn't a very pronounced 8 khz peak actually, it is not fatiguing.
Blon Cardinal was the predecessor of the BL-03, it is slightly brighter than the BL-03, but retains the same analoguish timbre and thick note weight. Shells are like the BGVP DM6 resin shells, look like semi customs. Much better fit, better isolation/subbass and marginally better technicalities. I still keep my pair as of today, but it is out of production and was retailing around $60 - 80 USD so it is questionable whether one should buy the Cardinal for a marginal improvement over the BL-03.
BL-05 (non S) was a fail, very shouty in the upper mids. Metallic tin can timbre. Nobody talks about it nowadays.
BL-05S (yes S version) was much better, I do think it is the 2nd best BLON. Balanced, mild V shaped set. It fixes the mid-bass bloat of the BL-03 and the shoutiness of the BL-05 (non S). More technical than the BL-03. Unfortunately, it came in a hospital green shell, and a lot of consumers got burned by the BL-05 (non S), these factors probably lessened the amount of people willing to try the BL-05S, so it is kind of forgotten nowadays too. I ever wore the BL-05S on the subway and got tons of stares like I was an alien from outer space, due to the green shells.
BL-01 - hard to drive, not much value add from BL-03. Fit was also iffy. V shaped generic sounding meh CHIFI.
BLON MINI - macaroni shaped IEM, lowFI sounding.
After that I gave up on the brand and didn't try some of the other recent releases, eg
BLON BL-07, BLON Max, BLON A8 Prometheus. Reviews seem lukewarm on these, and these didn't garner much mainstream attention. And then we have the
Fat Girl BLON, which seems to have been whacked badly on first reviews.
TLDR:
BLON BL-03 is still their most prominent and famous IEM, pairing good timbre/tonality with crap technicalities. Sadly, they seem to have lost their way in recent times, living on past glories, and releasing mostly meh sets since then.