I've actually done this, and the response from the throttle is noticeable. Not a 'stellar' increase in performance, but responsive is the best word to describe it.
I was worried about messing with the only slide I had, so I ended up contacting the author in the article to order an additional slide. If I recall, it cost about 11 USD + about 25 in shipping from India. So I have 2 slides.
One thing to note is that I believe as a result of this mod (I say believe, as I changed a whole number of things and cant be certain the slide mod is the root cause), is that my starting procedure really changed. After rejetting, and opening things up, I couldnt start the bike either cold or hot consistently. Before all my mods, I was kicking it easy with just choke. Not so after the mods. It acted like it was missing air. So now, I hold the throttle at about 1/8 open on kicking over (which should be a no-no), and I get zero kick back and 1st kick starts; hot or cold. You may not experience the same thing as each bike has it's own personality. It works for me.
Would I do it again? Yes I would... I like the CV carb, but would like a little more performance out of it between 1/8 and 1/2 throttle. When I wack it open, it goes nicely!