The eBay seller of the Muse DAC is certainly not as responsive or friendly as the seller of the Aune units. That being said, I've been thinking about getting the Muse instead of the Aune for two reasons:
1. Price, currently (on eBay) the Muse is $40 cheaper than the Aune
2. Muse has an optical input. Frankly, for better or worse, coaxial is practically extinct; I'd love to use a digital coaxial line into my headphone amp, but unless you want to run everything through a converter of one form or another, you're going to find that most common audio sources just don't do digital coaxial. CD/DVD players, TVs, computers, and video game consoles are all much more likely to have TOSLINK than digital coaxial.
Something I do wonder about though is the line-out. The Aune does not amp the line-out (the volume knob doesn't control the volume for anything other than headphones), what about the Muse?
Also, can anyone really compare the construction quality? I've heard complaints about the Muse being made cheaper; does this mean the unit is likely to break, that it will feel cheaper (such as the volume knob wiggling, for example), or simply that it is a bit worse quality, but the consumer is unlikely to notice the difference?
Any thoughts would be welcome, if anyone is still interested in talking about this topic.