I purchased another ALO Audio Key after I realized that I really didn't need my other DAC and I could just use a USB DAC to connect to my speakers. I was incredibly impressed with everything about the ALO Key previously, but I was concerned about pops when using my Dell Venue 11 Pro which is why I had returned it.
After getting rid of my other DAC and any Microsoft product from my life, I thought it was time to revisit the Key. I got the black version and I'm happy to say that I love it! The build quality has improved because not only does the cap fit perfectly, it also seems to be made from the same material as the rest of the casing. I wasn't sure if that was the case with my previous purchase.
I've been using the Key with my SR-71A to Shure SE846, AKG3003i, and NAD Viso HP50. I still think the DAC chip used by this USB Key is the best mid-range DAC on the market!
For those of you using alternate operating systems, it works terrific in Ubuntu and on the unstable chromeos builds. I was hoping to use it on a stable chromeos build loaded with crouton and Elementary OS, but no luck.