I got out for a quick skate this morning. I was coming from a 263 Lightspeed holder with ls4 steel, stock radius but probably even shorter due to years of sharpening (standard ⅝). I swapped to a 272 i2 with DLC steel on a ¾ hollow.
I started with the 23 radius insert. With that one it felt like I was really planted, which is probably due to the longer steel and 11' radius. Straight line speed felt better, but edges felt a little too locked in.
With the 20 it felt much better and a bit more similar to my old skates. Speed was still good, stability was great, and edges felt locked but not too stuck.
17 I started to feel the rocker more. Still felt fast on the straight aways, but edges were looser.
14 felt really nice on the edges, and was a bit more "squirrelly" feeling. Less tracked when going in a straight line.
My skating style (more power/straight line than agile/quick) felt best with the 20', so I'll start with that. I can see the benefits of the 17 as well, so I'll maybe test them both out tomorrow during gameplay.
I was definitely second guessing/overthinking if one blade was pulling due to the botched mounting job, which I had a second shop "fix". I'm not sure if that was just in my head though.
Overall they feel pretty good. I only spent about 20 minutes on them, so I'll have to update once I play a game with them. I'm the kind of person who likes to have stuff to tinker with, so that aspect of it appeals to me. For the average player who just wants to toss on their skates and go, I'm not sure they would see the benefit of the upgrade. I will post another update in a couple of days.