For me it's all a matter of what other iem you can compare it to. In my case it's the JH 10x3 and SE-5.
Even though UERM isn't much cheaper than the SE-5 (~ 1100 vs 1300 €) here in Europe, it doesn't come close to the SE-5, esp. in the bass, attack/decay and presentation depth. The UERM sounds quite samey on each recording (treble is always empasized), while the SE-5 sounds quite different on each track.
The JH 10x3 (~ 800 €) is more exciting than the UERM with a slight focus on bass instead of treble, which is sparkly but inoffensive. The 10x3 has less depth but approx. the same width in soundstage but less air between instruments. The whole presentation is more forward and engaging. The bass isn't the cleanest compared to the SE-5. The mids, however, can keep up very well with faster music - they're just not as micro-detailed as the SE-5's. Less than ideal recordings don't sound as bad as with the SE-5. Not suited for classical / jazz / etc because of the missing soundstage depth and missing air between instruments.
If you don't care about bass and want to have empasized treble and laid-back presentation, the UERM might be for you.