I have a Steez 100 HL and a Steez 103 HLA, both of which are two of my favorite reels. I'm thinking of switching out the stock spools with a Hedgehog Works SLP 105 SV spools. 

 

What kind of difference would I see if I made the switch. Anyone here do something similar? And if so how did you like the change?

As stated above, less overall distance with better control. In my opinion, the best spool for a Steez is hands down the rcs1016. It offers a little bit of the best of everything.