A good upgrade? yes. A good price NOOOO!! (if you're talking US) - you could get an HDAM shipped to you from China for that, which would be a much better upgrade. If you're going to spend $55 I'd go right to an HDAM (think of it as a souped up OpAmp that was designed for audio specifically).
I cant remember the place/person who was selling the HDAM at a good price. Where have all the ppl here who have done the mod sourced their HDAM from... I hate to go thru 800 pages of info....