Not many players support DLNA. With 300R I tried BubbleUPnP and USB Audio Player PRO. The former worked smoothly while the later was quirky, which is weird for a paid app. Of course USB Audio Player PRO seem to detect the DAC and use HiRes driver (at least it says so). It is up to you to decide...

Yes I've been meaning Amazon JP itself as they offer the lowest price on XDP-300R. ￥38,137 (￥36,851 + ￥1,286 shipping to the US) is a real bargain.

Amazon subtracts some tax (either VAT or similar) when sending abroad. I ordered mine recently and the final price was ~8% lower than listed. Shipping was also super fast.

In theory, you don't need to install anything. In practice, however, it is often hard to say if aptX is actually being used. There are some headphones that explicitly indicate the operating mode (like Audio-Technica ones).

The irony is that aptX or aptX HD are lossy codecs. While all the marketing that surrounds them tries to create an impression they are analagous to CD/better-than-CD.

  That's a comprehensive list of aptX-enabled headphones — https://www.aptx.com/products?field_product_category_tid=125

  Does this mean you don't have solid QA in place? I mean discovering outstanding bugs after the software has been released.

Not sure this is a proper thread to ask, as the discussion mostly goes around streaming music, blackberries and other things.   Is there a list of the apps to be supported on X7? I am particularly interested in any of Last.fm scrobblers.