Great sound, poor fit, now if I could only find it!
599284
I bought this to replace an earlier Blue Ant headset.  The sound was definitely better, the fit thought was terrible.  I don't even want to think about the number of times that I had to play with it to get it to fit into my ear right.  Notice that I said "had to play with it", that is because I don't have it anymore.  Had it for probably a month or less but because of the fit, it is gone.  I tried looking in the car and everywhere else, but never came across it - so if you are going to use this product, I might suggest trying to get a custom made earpiece for it. If I still had it, and took my own advice about a custom earpiece, I would probably rate it a five, but losing it so quickly and being out the money kind of dims my overall view of the product.
348222
I had to replace my Altec Lansing Bliss Platnium ear buds, which had a great fit (too bad I lost sound out of one side) .  Since the Altec ones are no longer available, these seemed like the next best choice.  They are OK, definitely better than regular size ones, but still a little too snugly with the caps that they come with.  However, after I replaced the caps with ones from my old Altec Lansing buds, they fit great.  If you are looking for fit, try these.  You can get better sound quality from other buds, but great sound isn't worth it if your ears are killing from over sized buds!
4431061
The fit is extremely tight in your ears.  I do not want to leave them on too long, I am afraid they will damage an ear drum, they are that tight.  There is a lot of feedback here about the tight fit - I hope Koss responds with a looser pair.  The sound is okay, and comparable to the discontinued Sony MDR headphones.  The fit is very bad, however, and I will not use these as a result.
1194389
To say that I have a few sets of headphones would be an understatement. I have tried a few sets of ultimate ears headphones, and think that they sounds really nice. A very full sound. Typically, you will get above average highs, mids and lows from them. These were no different straight out of the box. As I used them for a while, They did sound better.

My problem with these headphones is the fit in my ear. Depending on which tips I used, they were either too big or too small, or just wouldn't stay in, regardless,  I could never get a really good fit. As such, I never found them to be truly comfortable. Yet, the important thing about this, is while this did both me, they may fit someone else perfectly.

It really was a shame, becouse other then how they fit, I thought they were excellent headphones in this price class.

Note:
IF YOU NEED THEM TO WORK WITH A PHONE / IPHONE, LOOK FOR A SET OF HEADPHONES WITH A MIC AND END BUTTON.
566514
I used an older version of Sennheiser with much success so I was disappointed that the sound of these and especially the fit were not up to par.  I have tried all the different plug sizes with the medium size being the best fit, but I still have to constantly reinsert the earphones while running.  Annoying.  Plus, the little hook at the top is basically useless.
2598514
Although this came with different interior ear fittings I just can't seem to find one that fits my ear comfortably. It also came with an additional wrap-around ear piece but it's exactly the same size as the original one and I wish it was a smaller size. I can't wear this for longer than a short conversation which defeats the purpose of my buying it as I was hoping to use it as a driving aid and it is a little cumbersome to get on (for me, anyway). I'll give it to my husband and see if it works any better for him and update the review if so but as it is, if you are petite like I am you would be best to continue looking.

As far as function goes, it sounds good and feels of good quality. I've never had anyone complain of background noise and the call is clear on my end as well. I just wish it fit better!
1399553
Sound is good, however, begin small on the outside (and they are relatively small) means also being a tight fit - too tight for my ears.  I have to bend my ear to fit.  Only buy after you try for fit.
2420486
It truly is a shame that these headphones were discontinued as they were a wonderful combination of looks, performance, and comfort. The PMX 70's come in a stylish neon green and fit perfectly.  They do not jostle, whether you are walking or running, and they are light enough that you often forget they are there.  The sound provides a good balance of treble with enough bass to keep you happy during workouts. When a friend finally broke my pair accidentally I bought the updated version and what a disappointment.  Sometimes a company, in an effort to innovate, does not realize they have created close to a perfect product already.  The updated version of the PMX70's is divided in two different pieces, with a little plastic knob connecting the two that allows you to alternate the volume.  The problem is that during a run/workout/it getting caught, the headphone can become disconnected from the plastic knob and cut the music off.  Further, the little plastic piece is very uncomfortable and requires you to snap it to your shirt which is 1) a half-pain if wearing a shirt and 2, if no shirt, a complete pain.  Stick with these originals.
1284645
I tried all size combinations and could not get a fit that felt like it was right. They are comfortable but it takes some adjusting to get right amount of sound.  If you do not place them just right, volume is lower.  When you do get it right, they sound great. I plan on returning.
1476100
I bought this close to a month ago and due to personal reasons, I never really got to use it up until  last week.  First, the sound is awesome and I liked it on my first use. Haven't used the mic and/or phone feature.  Only downside is that it is just too big!? I mean, I have the average size head (I thought) and even at the smallest setting, it just doesn't fit right and below my ears and it keeps slipping off my head when I'm jogging and/or on the treadmill.  I'm hoping that even though i just missed the return window by 1 day, the company will consider in taking it back as it was only used once.
2232354
Did not fit, period.  I went to the Bose store and they were quite knowledgeable and exchanged them for a set that fitted perfectly on my older on the ear Bose QC earphones.  The Bose store gets top rating by everyone (see Consumers Reports) and they deserve it.  The site help by phone insisted that they should work but there is no way that anyone can make them fit.
589509
Can't find a headphone that'll fit through the opening in this case.  Found out too late and couldn't return.
2940013
Good sound, but I should have paid attention to the reviews that said the earphones are too small. Indeed they are. After about 15 minutes I felt them uncomfortable on my ears and after 30 minutes I had to take them off for relief. I am sending them back to Amazon and getting the Bose QC 15. The QC 25 is out but from what I gather from the reviews they are not that much better than the QC 15's and lack some of the features.  The only thing is, Amazon is charging for the cost of returning the headphones because I found they didn't fit my ears, not because there was a defect in the product. So keep that in mind if you buy these and find them too small for comfort and you have to return them, you will be paying the freight. If you are in the market for high end headphones, it may be worthwhile to go to Best Buy or Apple or some other store to try them on before making a decision.
2037628
Costco had a deal on these, so I bough them. However, the smallest size eartip is still too big (and I am a 6'3" man). I couldn't get a comfortable fit, so I returned them. I ended up buying (from Amazon)&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Klipsch-Image-S4A-II-In-Ear-Headphones/dp/B008VHHYLW/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Klipsch Image S4A - II In-Ear Headphones</a>. The smallest eartips on the S4A-IIs are smaller than the UE350s, but still slightly too large. I haven't decided if I'll try to make the S4A-IIs work or find some earbuds with smaller eartips.
4437485
I would imagine they probably would work great if it actually ever freakin FITS.

I bought it a while ago when they were cheaper (around $13 including tax) and thank god i didn't pay $20 for them.  Even $13 too much -_-;;  The color is really nice, but I can't get the stupid thing to stick in my ears no matter which of the heads I switched.  Not only does it not stay, the overall sound is horrible (possibly because it wouldn't stay in my ear and thus there's always this sound/air gap?) and sound vaguely like the old crappy midi, nicely flat.  The over-ear wrap portion is incredibly uncomfortable as well.  One ear works okay, the other seems to bend in a very unnatural way that I can't seem to get around my ear.

Overall, they suck.  I seriously regret wasting my money.  D:
1275841
Simply put, these buds sound awesome.  They come packaged in a top notch presentation, with a case, adapter for aircraft (older 2-prong) and multiple tip sized in silicone and comfort foam.  For the life of me, I could not find a comfortable fit with the included tips...and was about to send these back...until I decided that the sound was worth perhaps a little work on the ear fitment.  (I could get them to fit, but not comfortably for an hour plus).  So, I ordered Stay Hear+ bud tips for Bose, and they fit...and, they are AWESOME.  You can order white on amazon, or smoke from Bose directly.  $10 for 2 pair (and FS from Bose...crazy!).

Now, if you want to check the size (they come in S,M,L), you can order these knock offs which also work very well:  https://www.amazon.com/gp/product/B071JK2ND6/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1 and they come in all three sizes.  The sizes match up directly with the Bose StayHear+.
302458
Sound was great but i love bass.  Bought several at one time.  Returned this one today for a few reasons. 1. Too tight.  2.  I don't  trust the folding contraption.  3. Wanted over the ear instead of on the ear.

Pros:  sleek look.  great sound.  connects quickly and remains on standby for several days.  Solid hard case.

Hard to believe that i am actually returning this unit, but my big head makes this not the best one for me.