just got the package recently, I earlier had one fiio e5 but lost it somewhere.. though didnt used it much, I am thinking of getting a pc amp/sound card so that i do not have to charge batteries and it will eliminate the chance of misplacing it.
You can buy from #[member='PristineNote'] (See here) with local warranty or directly from Audinst on eBay.
Ask #[member='Chaos'] about the performance before deciding. I've not used MX1, so not sure about how much driving power it has. If you are going to be using it with anything other than HF5, that's one thing to get cleared about up front.
Our new stock of M1X will be arriving in a few days . Its by far one of the finest DACs we have tried under 10k . If you are looking for something cheaper , you can consider the Fiio E10 .
EDIT : HUD-MX1 is in stock now, You can purchase it from here.