Upgraded my DR5000 using the YD9401 module yesterday, received very quickly from DDC train automation. Fairly straightforward upgrade although I had to restart my PC after installing the Yamorc software before the DR5000 was detected and the new license file could be applied.
First impressions - being able to use the LAN and the standalone wifi network at the same time with lots of protocols is much more useable, I'm a Loconet user but being able to mess with the Z21 app at the same time is amazing. In summary worth the £60 to bring the DR5000 up to what it probably should have been in the first place.