Just received a KBEAR KS1. They look like some Stormtrooper armour!
V shaped tunings are dime a dozen in budget CHIFI sets, but the KS1 is a well tuned V shaped set. Not the usual boomy bass or sibilance fest type V shaped gear we see released on a weekly basis. Tonally good, timbre is good too, very natural and organic. Technicalities like microdetails and imaging are perhaps below average compared to multi BA/hybrids at the budget segment, but for the price, this is a good set to just kick back and relax and listen to the music for what it is. It is a V shaped set though, so midlovers best consider alternatives as the mids can be a tinge too hollow, but this is dependent on source too.
At the same price bracket, I think the main competitors would be the BLON single DD sets.
- I actually like the KS1 more than the overly hyped BLON BL-01. Tonality is similar between the 2 sets actually, but the BLON BL-01 has an atrocious fit, and the BLON BL-01 needs amping to scale to its optimum. I see some folks on audio forums and facebook recommending $200 USD sources/amps for the BLON BL-01 to get it sounding good, that's talking about a source that costs 10 times the IEM, and the clientiele at this price segment probably aren't so hardcore to dive into a source that costs that much! A lot are also recommending to swap cables and eartips on the BLON BL-01 just to get it to sound better or fit better (which adds to the cost). Thankfully, the KS1 doesn't need these aftermarket stuff, it works well OOTB in terms of fit and sound, and can be driven on a low powered smartphone.
- From a brief comparison against the venerable BLON BL-03, I would consider them sidegrades. The BLON BL-03 is more bassy with a slower bass. Timbre is probably more analoguish on the BLON BL-03, but have to do further A/B testing between the 2 to compare technicalities (thought for sure both ain't technicalities tour de force sets). BLON BL-03 of course is infamous for having a crap fit and most people require aftermarket cables/tips to get a proper fit, so the BLON BL-03 IMHO actually is not a sub $30 IEM but closer to $40 - 50 USD if aftermarket gear is factored in.
TLDR:
The KS1 is a good set for those new to this hobby, it has an organic timbre and tonality, a well done V shaped tuning. It is a useful beginner set, especially for those who don't want to mess around with sources, tip rolling or cable rolling, and just use it OOTB. But perhaps those who are recalcitrant CHIFI addicts who own higher end gear, you will have heard something with better technicalities, but for 20 bucks, this set is really not too bad.