I think I'll try my luck bidding on the U3 then thanks! And I'll be using it in conjunction with the Mixamp or the Mixamp 5.8 at home, presumably this should have a better sound. And since you said I should only have one device doing so, am I able to turn of DD from the U3 (since I only really want this dongle to work as an optical passthrough at home) so I can rely on the DD from the Mixamp, and when I want DD I'll switch it on for when I'm on the go. Sounds about right, right?
Sorry, I feel like I'm hassling all you guys :(
By default, the card starts in normal mode. When you enable game of movie modes, that turns on DH processing. So as long as both of those are turned off, then it'll be outputting DD which the mixamp will then process. Then when you're on the go, toggle on movie or gaming mode and you'll be golden. I will also point out when I'm on the road that the game dictates which mode I use. If I'm playing a single player, I tend to prefer the sound of movie mode. When I'm getting competitive like TF2, I use game mode. Just use whichever sounds best to you. And for the record, I still own both the Micro II and the U3. The U3 stays in my laptop bag and the Micro II stays with the mixamp at home. Had I not already owned the Micro II, I'd have just used the U3 for both.
And I can't speak for the others, but it's no hassle. I'm pretty sure we're all here to learn and help where we can.