MAG 254 is a touch more “agile " and loads a bit faster , browsing the pages of TV channels also a bit faster.
A difference can be found only in critical situations, such as watching an HD channel while recorded transmission from another HD channel, and during that time browse lists EPG- programs.
The hardware has some advantages that enable to be add some "extras " . The most interesting possibility , I think, is the availability of 3D- hardware decoder. It comes to "real " 3D (MVC, in blurey discs ) , not encoded in two half - frame left / right or top / bottom. Already many portals offer high quality 3D movies.
For live television , most memory allows to add long ( more detailed ) descriptions of movies and shows