However, I did feel I got a slightly better fit with the RP-HJE120s. I got a little tighter seal from the eartips (three sizes are included), and they felt slightly more comfortable. I think part of the reason for that is the HJE120s' all-plastic design makes them lighter (they also seem to be a touch smaller).
Neither model has a built-in microphone for making cell phone calls, a feature that's become a must-have for a lot folks. It's worth noting that this model has an L-shaped plug (it's smaller than the RP-HJE120s'), which is good. But that plug may not fit into the headphone jack of some phones equipped with thicker protective cases (which causes the jack to become recessed).
Lastly, no carrying case is including. That isn't expected at this price point, but I thought I should point it out.
As with a lot of these noise-isolating earbuds, the fit of the eartips and the type of seal you get makes a huge difference in terms of sound quality. If you can't get a tight seal, you lose a lot of bass.
One of the different-size eartips should allow you to get a tight seal. However, a small fraction of users simply won't get that tight seal or find these terribly comfortable. That caveat aside, the RP-HJE355s are a very solid set of earbuds for the money. Without any trouble, they could pass for earphones that cost twice as much.