I bought these last year, reading all of the good reviews here, and thought I had a can't miss winner.
Unfortunately, I was disappointed after my first few listens. Way too much treble, tinny and generally cheap sounding. I tried burning them in over a few nights, and the sound signature did not change one bit. I stuck them in a drawer and forgot about them.
I recently decided to give these IEM's another chance. I made a couple of quick tweaks to my setup using these and am now very pleased with these inexpensive iem's.
Here are the simple changes in my setup since last time:
1. I run these IEM's through a Fiio E5 amp. These iem's are very underpowered and don't sound good at all without an amp.
2. they're still too bright however, despite sounding much better even with an amp. Therefore, I experimented with various EQ settings on my sansa clip. A few clicks in and I quickly realized that the "pop" EQ setting sounds just about spot on. This setting tames the very bright, overemphasized highs quite a bit.
With an amp, and the proper EQ setting, these IEM's are just lovely. They're especially enjoyable paired with older recordings that don't have a lot of treble information already. My boz scaggs and rolling stones tracks sound surprisingly modern now that the philips add just a touch of sparkle and shimmer.
I do think these IEM's could become fatiguing at higher volumes, especially with tracks that have a lot of treble emphasis already.
Overall, for $10 IEM's they are very impressive.
If you've bought these IEM's and aren't happy with them, try pairing them with a quality headphone amp, and EQ them to reduce the treble a bit. I think you'll like the results a lot.