There is a paradox about Liszt: Some of his music is absolutely extraordinary and some of it is not very good at all. When it came to quality, he certainly wasn't the most consistent of the Romantic composers in that respect. His more experimental late works are in a category by themselves, of course.
When I listened to this excerpt of the Grande Concert Solo (Grosses Konzertsolo), I knew I had never heard it before. There is no mention of the piece in Friskin or Barnard, but I did find it in Hinson. It was a piece (a lengthy one at around 23 minutes play time) written around 1849 for a competition at the Paris Conservatory and dedicated to Henselt. It's difficult to judge its merits just from the brief excerpt posted here. My sense though is that the piece is apparently obscure, given that it appears only in one of the three repertoire guides I checked.
So is the prevailing verdict that Liszt covered himself with glory with this virtuosic display piece, or does it fall more into the trashy genre of his ouvre?