Mic- 9/10 I have found the mic to be really useful, I use it when I Skype on my android phone. The people I talk to tell me they can hear me loud and clear. The only fault I can find the mic is that it is further from my mouth than I would like, but this depends on the individual. Construction- 10/10 The earpiece is all metal and its really sturdy, haven’t had any problems with it after a few weeks use. The cable is also well built, it doesn’t make rustling noises while the cables are rubbing against each other. Definitely the best constructed IEM I have purchased considering its price.
Bass- This is the main selling point of the SP51P, you can tune the bass to the level of your liking. Meelec provides 3 different tuning ports, Silver, Gunmetal and Black. I tend to keep it on black (most bass).
I haven’t experienced an IEM with this much bass, the SP51P is definitely best in the bass category
I got these through the MeeWhat? promotion via Mee's Facebook page...
These are unreal! Simply amazing headphones. These have done well to put some brand names to shame. I run the black ports on mine and the bass is sensational. I'm only 10-15 hours on the burn in, pretty impressed with the out of box performance.
I've owned many many pairs of headphones and these have really impressed where many have failed to deliver. I have the M11+ as well but these are by far my fave.
Shame these aren't in red like my M11+ but the sound is definitely more important and certainly no failure there.
Only Gripe would be my Nexus doesn't really drive them like my Macbook does.. These certainly respond to some amplification!
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2 of 2 people found the following review helpful:
BEST by far
June 8, 2012
Reviewer:
EL
from san jose, CA United States
sounds extremely clear. once burned in everything smooths out. better than beats. bass is EXCELLENT using the grey ports. highly recommended
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6 of 6 people found the following review helpful:
OUTSTANDING
October 10, 2011
Reviewer:
Otilio De Jesus Jr.
from Austin, TX United States
Search no further, these headsets are tops. The clarity of sound is incredible. Basses are there, highs sparkle, mid range and vocals floor me! gonna get a pair for my wife, ( she's jealous ) Just ordered my second pair,for my wife. Did not hesitate to click on the confirm order button. I've had my set for about a month and they continue to amaze me. I also have to say that they are extremely comfortable to wear for extended periods of time. All I can say is WOW!!!!
Amazing Bass and Value! 
Truly Great Sound...