When comparing Koss i150 vs VJJB V1 V1S, the Slant community recommends VJJB V1 V1S for most people. In the question“What are the best rugged and durable earbuds & IEMs that last?” VJJB V1 V1S is ranked 11th while Koss i150 is ranked 12th. The most important reason people chose VJJB V1 V1S is:
An overall balanced sound with slightly emphasized bass. It's not thumping bass, but it's not anemic either and it doesn't bleed into other ranges. Mids and highs are clear with no sibilance. There's close to no distortion in any of the frequencies. Even the soundstage is fair for the price--while it's still rather cramped, the instruments are separated out enough for them to not sound like they're all coming from the same place. It's a sound quality that's typically present in earphones that are in twice as expensive.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro 4ft cord
Cord is long enough for all uses.
Pro Clear Balanced Sound
Crisp and clear sound. Quite good for earbuds of this size.

Pro Warranty supported after over a decade and a half
There are tons of stories from customers that talk about how they supported their warranty after decades with no receipt, at only the cost of shipping and handling. Koss really means it when they say lifetime warranty.
Pro Great sound for the price
An overall balanced sound with slightly emphasized bass. It's not thumping bass, but it's not anemic either and it doesn't bleed into other ranges. Mids and highs are clear with no sibilance. There's close to no distortion in any of the frequencies. Even the soundstage is fair for the price--while it's still rather cramped, the instruments are separated out enough for them to not sound like they're all coming from the same place. It's a sound quality that's typically present in earphones that are in twice as expensive.
Pro Very comfortable for everyday/casual use
The earbuds are light and small with an angled nozzle, fitting most ears comfortably. It's comfortable to wear both over and under-ear.
Pro Will last you a long time
V1S earphones have a metal housing, strong rubber wires and a durable rubber stress relief to make sure that the earbuds last. However, they aren't water resistant.
Cons
Con They don't handle water or sweat well
They aren't sweat or water resistant.
Con Not a good option to use for exercising.
Along with not being sweat-resistant, they tend to slightly move around in your ear regardless of chosen eartips. This can be distracting.
Con Some cable noise is present
Cable movement will result in unwanted audio signal that can interfere with the listening experience on lower volumes.
Con The L-shaped plug can put stress on the cord
