I have some
NuForce NE-700M in-ear monitors. The bass on them strikes me as probably stronger than reference, but they sound absolutely fantastic. The bass is well represented and I can hear things much lower in all of my songs than I've ever heard before. Everything else about them has matched or exceeded my expectations. I wouldn't say I'm an audiophile, but I think these are really good. Easily the best sound quality I've heard.
I also hear that their lower-end in-ear monitors are really good, but I don't have personal experience.