I purchased these against the recommendations of some of my homies, LOL...I just had to try them. I got the yellow ones from Amazon for $45.
As of late, I've been wanting a decent all-rounder that has a slight lean toward bass. Used to run a Dell Jukebox with Senn EH350's back in the day.
So I tried the MD Trib's and felt them to be too harsh on the top end.
PortaPro's are pretty good, but lack some clarity and have a sloppy bottom end.
Tried S4's, but they sounded quite fake...like you're listening to a plastic driver in a plastic tube.
VModa remix's had great bass, but were only good for HipHop and songs with unnatural sounds.
The closest thing I could find was the standard Turbine. It sounds pretty good to my ears. Plenty of bass extension and quantity. not overpowering mid's/highs. Def. not a reference IEM, but a great universal for most things. I still don't like them as much for rock, but they're better than the other's here that I listed with the exception of PortaPro's. PP's are not bad in the rock realm.
I was still wanting a "can" and just can't make myself get something as big as the M50 or K181DJ for port. use, so I tried the k518LE.
These are about as close as I have found to the sound that I'm looking for. The bass isn't "overpowering" as some have stated. I think it's pretty balanced. A little less bass quantity than a standard Turbine. The mid's and highs are much better IMO for an all-rounder. I have no issues whatsoever listening to rock with them...though they really shine in the DJ realm.