The reason the Vu+Duo is reduced is because it has been superseded by the Solo+ 2 which is a newer receiver with a faster cpu .
The Duo is still a good box ,it works well ,and the support for it has reached stability unlike the Solo 2 which is relatively new.
The Duo was always overpriced at £300 for which it sold for years,its a good box but not worth that .
Enigma 2 on the Alien is improving ,its alot better now than it was 6 months ago .
I have one running a newish version of HDMU and it works well,its fairly stable now ,it took a fair bit of tweaking to get it right,its nowhere near as user friendly as the Dreamboxes or Vu+ units.
I still use a Dm800 clone running Dream Elite Phoenix as my main receiver though as its rock solid .
The Alien 2 is way faster that the Dm800 to boot and load up ,even Cross epg runs much faster on it .
I will switch over to the Alien 2 as my main receiver when I get time, as it has a twin sat tuner which is handy ,it also supports streaming,like 1channel which doesnt work on the older Phoenix image.