I for one adore the Bonneville, easily became my faovorite IEM that I really cant live without. When I reviewed Bonneville I give it a subjective score of 5 star on head-fi, this was easy for me to decide on as almost no other IEMs have given me the same amount pure joy.
Already had a talk about
@thaslaya in PM about Bonneville, very different than how I perceive the Bonneville. But that is okay, we are sensitive to different things and IEMs is dependent of how our ears are (none are the same)
There is also the bias for what one is used to, most IEMs coming out are tuned very different than Bonneville.
I often hear the arguments about muddy/bleed bass into the mids, then I hear the IEMs myself and think this is soudning good and how it should be. The bass tuck style that I guess is very normal from Moondrop that also many other brands tune with, this sound unnatural to me and not as fun and full sounding. Bonneville is not following the tuck style at all, and since the bass is quite agile it doesn't sound to thick or slow. There is some coloration and more in amount, but that's what makes it so fun and lively.
I hear no sibilance at all when listening to the upper mids and treble, there is good bite on the treble so stuff like cymbals have good sizzle. But never harsh, some music that has a lot of treble emphasis can get tiresome to me. Often it occur more on electronic music and never with acoustic instruments.
If there is one thing, brighter females do lack some bite and energy and this also goes for some instruments. But I dont see it as a downside, more of tuning choice. In return music like death metal have good body and clarity without being to shouty or energetic.
I also love the fun and bold color design, and for others it's the safe black.