Summary: I bought these at a closing sale for $20 and they were definitely worth the money. The bass is excellent for bassheads on the go and the sound isolation is excellent for noisy areas like bus rides. They are pretty comfortable and are easy to fit because of the shape. They're also pretty loud at low volume and with a proper rig you can get some serious bass out of them.
The bass is what really grabs your attention when you get these.
Pros: bassy, great quality, very solid build
Cons: i had two pairs that broke after a while, gave up on them
The easiest way to explain the Sennheiser CX-150's is that they do what you can reasonably expect. You can't really expect much from a pair of sub-50 dollar IEM's, and frankly, I was pleasantly surprised by the general quality of the CX150's. The sound quality is fine enough for portable listening from an iPod, as I use them, and I have yet to hear anything less than serviceable come from these IEM's.
Pros: Punchy Bass (especially for a pair of low-grade IEM's), Relatively comfortable, handle vocals very well
Cons: Incredibly microphonic cable, cable also very prone to tangling, tips tend to fall off
Summary: I'll probably end up keeping these since the price was ok. Disappointed in the bass but they're acceptable for using at work. I work in an office environment and listen to music most of the day.
Pros: Very comfortable. Multiple bud sizes included. Honestly the most comfortable ear buds I've ever owned. The rubber is very thin so it doesn't press hard against your ear canal at all while still keeping a tight seal. Cord length is long enough to wear under jacket with phone in pocket with enough slack to pull out phone to look at screen. This is a huge plus for winter. Canadians know what I'm talking about!
Cons: These buds have crisp highs but have a pretty big lack of bass. I've tried all 3 bud sizes and still have the same problem. I compared these buds to my old Skullcandy Smokin Buds and the Samsung buds that game with my phone and the Sennheisers have the weakest bass of the 3. They sound more crisp than the others which might be important to some people but I enjoy some good bass. The Skullcandy Smokin Buds are still the best earbuds I've ever owned in terms of sound qu...
Pros: Excellent sound quality, comfy, and blocks out a lot of noise. And very cheap if you time the sales right. Honestly the best headphones I bought for under $50
Cons: Cord seems a little short to me, wish it was a bit longer, and as others have stated the chord does make some noise when it rubs against your clothes. I certainly do not recommend using them when you run.
Summary: Not sure id bite on these at 30 each, but watch around there are frequent sales/promo codes off of the egg's eblast.
Pros: Grabbed two of them for 15 each. One for me and one for the GF.
Cons: The cord does pick up vibration from movement on or along surfaces quite well and transfers this to the earbud housing to where you can hear it. As others mentioned they might not be good when jogging/moving around a lot.