I have a set of Fir EL19 wheels with Shimano 105 Uniglide 6-speed hubs that I intend to use with one of my Arabesque groups. After the highly contended feedback on the shift quality (or lack thereof) of the Arabesque derailleur, I am interested in opinions on how much shift quality improves with using a hyperglide cassette instead of a uniglide cassette.

To further complicate this, I think my uniglide freehub is one where a hyperglide cassette won't work. I've included a picture showing the splines are all the same size. Does this mean uniglide is my only option with this freehub body? Interestingly, it has a Suntour cassette on at present which I don't know even takes advantage of the Shimano design. Is the "glide" feature part of the cassette design?

Now I've seen the videos on changing the freehub body and modifying a hyperglide body to work on this hub. It's a fair amount of effort and more expense than I had hoped for so I'm really trying to gauge just how noticeable the difference would be in the Arabesque shifting. Anyone have any first hand experience with this?