For many years, Tausig's version was the encore of choice after recitals, but it has rather gone out of fashion along with much of his work.I cannot comment on the difficulty as I have never played it, but I have played his transcription of Weber's Invitation to The Dance, which took me about a month when I was at the height of my powers.His "Halka" Variations is miles above anything I could ever manage.Glad you are playing one of his works.
Nah - for me, it's Busoni all the way. I love his Chaconne in d minor transcription of Bach's as well as it really captures the sound, majesty and greatness of the organ throughout. Have a listen to this and see what you think, I was quite impressed with this recording.