I'm certainly not one to judge a device strictly on measurements, but a few of the posted ones seem disconcerting on the Lehmann Traveler.
Frequency response 20 Hz to 30 kHz (-0.5 dB) (I'd expect a little better tbh for a portable SS device)
Signal to noise ratio > 95 dB RMS unweighted at gain 0 dB (About 10-20dB worse per standard depending on weighting)
THD < 0.02 % at 3 mW, 330 ohms (0.02 isn't bad or great, but it's at 3mW; using an unusual spec might suggest something)
Output impedance 3 ohms (close to the corrected Meridian at 4.9 ohms and won't help the many IEMs below 20ohms)
Here's the Leckerton UHA6mk2 for comparison:
Max Output Power, AD8610 Op-Amp
16 ohms: 25 mW
32 ohms: 55 mW
62 ohms: 90 mW
100 ohms: 90 mW
300 ohms: 40 mW
(Measurement conditions: Analog input at 1 kHz, output <1% THD)
Max Output Power, AD8620 Op-Amp
16 ohms: 80 mW
32 ohms: 140 mW
62 ohms: 120 mW
100 ohms: 90 mW
300 ohms: 40 mW
(Measurement conditions: Analog input at 1 kHz, output <1% THD)
THD+N
16 ohms: 0.0033% at 1 mW, 0.0045% at 10 mW
32 ohms: 0.0018% at 1 mW, 0.0022% at 10 mW
62 ohms: 0.0012% at 1 mW, 0.0014% at 10 mW, 0.022% at 50 mW
100 ohms: 0.0010% at 1 mW, 0.0011% at 10 mW, 0.012% at 50 mW
300 ohms: 0.0008% at 1 mW, 0.0023% at 10 mW
(Measurement conditions: Analog input at 1 kHz, 20 Hz to 20 kHz bandwidth, no weighting)
Frequency Response, Analog Input
<3 Hz to 45 kHz, ±1.0 dB
5 Hz to 28 kHz, ±0.1 dB
Frequency Response, USB Input
<3 Hz to 21 kHz, ±1.0 dB
5 Hz to 21 kHz, ±0.1 dB
(Measurement condition: 44.1 kHz sample rate)
Frequency Response, TOSLINK Input
<3 Hz to 45 kHz, ±1.0 dB
5 Hz to 28 kHz, ±0.1 dB
(Measurement condition: 96 kHz sample rate)
Output Op-Amps
Internal Power Supply
±6 V, ground-centered, switching converter + low-pass filter
Battery life
Analog input: Up to 30 hours
USB Input (charging disabled): Up to 10 hours
Output Impedance
<0.5 ohm
So either I've biased any future listening to perceive the Lehmann as bad or expectations will be lowered making it sound better.