I need to have my Strats frets dressed, possibly re-fretted

The guy who will be doing the work is Yngwies tech

http://www.lashbrookguitars.com

Hes the only game in town when it comes to anything to do with frets

Anyhow, on his website, he says that he will also replace the nut with a graph tech nut (I can only ***/u/me that it will be a tusq nut???) for 50 bucks although I hoping he'll do a package deal since the fret job is 150 bucks.

Now on to my question, Did a Graph Tech nut make a noticeable difference with regards to sound and sustain on your guitar and would you recommend it?