Anyone planning to use these on a plane, be careful with which tips you're going to use with these. Every silicone tip felt absolutely, overwhelming, excruciatingly painful. Sometimes they just pop off, which hurts like crazy. Had a worse time with these in the air even compared to the ER4P. Since I didn't have any foams, had to resort to the sansa stock buds in the end. Driver flex is a bit grating after lots of re-inserting and re-adjusting. I'd say get some gel/foam tips, pop them in, and try not to mess with them too much while on the go.
If I could draw out my own FR graph from listening, it would probably look like a rapidly declining ski slope. Fun stock, and works perfectly with the bass reducer EQ on most DAPs.