I've had several Klipsch S4s and now I've bought a couple of these S3s so I thought I'd write a quick comparison between the two. SOUND QUALITY: The S3 is good for listening to speech, has good bass and full range, but not very good clarity. That's what you would expect for the price. Klipsch Image S4i-II is much better. Clear sound, good bass, comparable to $100 headphones. If you're used to $10-$20 headphones, the S3M is your best bet. Headphones/Microphone. When I use the S3M in a noisy environment during a phone call, people often tell me that they can't hear me well. The S4 performs MUCH better, especially while driving. CONVENIENCE: The S4i has a thin, flexible cable that can be wrapped around your ears during a workout and stays in place. The cable on the S3M is less flexible so it tends to fall out of my ears when running. S3M includes different sizes of ear tips and you can find other styles on Revain. Both work well as a phone headset as long as there isn't too much ambient noise, as you're not taking advantage of the noise-cancelling benefits of a smartphone's built-in microphones. STRENGTH: The cable of the S3M is thin. My Klipsch S4 in-ear headphones have endured many abuses, being pulled, hung, stepped on and have lasted for several years. I ruined one of mine by stepping on it. Make sure you are buying from an authorized seller as counterfeit Klipsch are sold here and on eBay. If it has a molded fork, it's probably real. EDIT: I replaced them with the Sennheiser MM30G, which are my new favorites in the under $100 category. https://www.amazon.com/dp/B00HSJRT7I/ref=as_li_ss_tl?ie=UTF8&linkCode=ll1&tag=stephens-nutrition-20&linkId=cc96d8388143571674747d5b14748d50
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