I haven't had the Wavelength yet, but the Benchmark DAC 1 PRE is in my home now and is a really good little unit. Very smooth and dynamic with excellent detail and air, top end is very accurate without being harsh, I haven't tried the headphone outs yet...
Wavelength Cosecant USB v3 vs Benchmark USB DAC1
Now that both the Wavelength Cosecant USB DAC v3 (now with ASYNC mode) and the Benchmark USB DAC 1 and DAC 1-PRE support 24-bit audio at sample rates up to 96 kHz without the installation of any drivers or other special software. I am having a hard time choosing between them. My primary headphones are the Ultrasone UE 9 and the Grado GS 1000. Has anyone out there heard both side to side at any of the meets??? Are there specific advantages of one over the other?