This piece isnt hard to play at all, it is reasonably simple tecnically. But, if you play the ending in time it can get extremely taxing, but Horowitz CANNOT play this piece on any level, he cannot even hit the right notes (even in early recordings), so avoid his recordings like the plague.
Tee hee..... I've got an argerich recording of this live in carnegie
I very much enjoyed listening to Idil Biret,Ed (running for cover)