Pros Light weight. Blocks ambient noise well. Durable. Stay in place while exercising.
Cons Can be a little hard to remove if you have worked up a sweat. A volume control on the cord would be nice.
Summary I wear these with my iPod Touch in the gym 3 days a week for several months now. It blocks the grunts, groans and bellowing from the hardcore free weight crowd (and the sound of them dropping the 75# weights on the floor) as well as the (IMHO) crappy music blasting from the gym's sound system.
They stay in place very securely through out my entire workout and stay comfortable the entire time. I sometimes forget I am wearing them. The cinch on the cord allows you to tighten the cord behind your head to keep it from dangling in your way while bending over (nice feature).
The base response isn't the best, but these ARE ear buds, so give them a break. They are DURABLE, so THEY won't likely break on you.
Pros My ears look like they've been pinned back and as a result the 'left & right' ear buds constantly fall out.
With these ear buds they mould to the shape of your ear canal. Wedge them in tight and its like a pair of noise cancelling headphones.
Cons You really have to shove them in to get the full sound, and when they get ripped out (eg you get your wire caught) it hurts. I'm on my second pair, they do get a bit mucky after extensive use, the porus bud doesn't wash easily.
Summary For the price nothing comes even close for me, and I've tried so many from Sony Grooves to Panasonic clip ons. Get faux noise cancellation and extreme volume from these buds which you can get in any colour to suit your mood.
Pros Very wide frequency range
Great noise isolation
Great comfortable fit
Nice powerful and "bouncy" bass
Not harsh on sibilants
Cons Marshmallow tips wear out over time, get "stale" and crack.
Bass may be overly strong for some listeners; it sometimes amplifies hissing noise.
A bit low on the mids and treble
Summary Overall the sound quality is great but may not be suited for everyone. At first I found the bass overly strong and sometimes amplifies tape hissing. Still the bass is rather "bouncy". The treble is at first a bit lacking and will require some burn-in to become clearer. I have also heard about the "kramer mod" for the FX34 (where the foam inside the earbud is replaced with earpad cushion thereby increasing treble and mids) but I'm not sure if this will work for the FX35.
The fit is very comfortable and the headphones do not fall my ears off easily. Noise isolation is superb.
Durability is great the cords are very thick and although they feel rather "cheap" they are very durable. The headphone jack is getting a little loose but has not bent. It has lasted longer than my Klipsch S4 which has bent and become unusable after less than a month of use.
Pros Impressive Noise Isolation
Surprisingly good sound quality for the price
No more uncomfortable than normal earplugs
Relatively easy to untangle
You don't have to crank the music very high on buses and airplanes because of sound isolation
Cons Can be less comfortable than normal earbuds
The cushions can come off if you're not careful
The cushions are hard to "mold" when they're cold
Minor microphonics can be irritating
A minor background "fuzz"
Easy to "yank" accidentally while running
Summary After just under a year of owning these, the foam eartips wore out and would no longer stay on the bud (they would get stuck in my ears). I didn't think the replacements were worth it since the cost is halfway to a new decent pair of headphones, just for some foam tips. I had some rubber tips left over from my broken Skullcandy Ink'd headphones, and found the large set fit nicely on the JVC's with the rubber sleeve left on. Not only that, but it sounded clearer than with the foam tips!