It's got two very distinct gears. Slow and fast. Not always easy to pinpoint exactly where it switches gears. I didn't like the setup too much. I like to generate a variety of paces, not 2. Also it sacrifices on power.
How I rationalize this behaviour is that the outer plies are soft, the carbon is near the core, and the hard rubber emphasizes the overall effect of a passive gear whereby much of the incoming power is absorbed and an active gear where shots become much more direct.
On the bright side the slow gear makes the short game extremely comfy. You can drop "any" serve short. You can drop shot on rather aggressive loop drives. Short serves can also puzzle some opponents at first. For instance backspin serves coming with less pace and depth than they guessed, causing bad misses. Flicking was ok. Quite safe, by default a bit less aggressive than with off- (and beyond) blades; but the differential in pace when you engage the carbon is neat. And the confidence to flick spinny serves is neat.
On the bad side... 2 gears. I found it hard to produce a medium paced loop (or serve). You choose between a slow loop and a fast drive. The 2nd gear is rather fast*, but not that powerful or threatening somehow compared to a Viscaria with H3N. IIRC on power loops Viscaria / TB ALC has the opposite behaviour of actually holding the ball relatively longer, which helps generate shots with speed and spin. Fast serves aren't as good with IF Layer ALC as with a Viscaria.
If I were to use an IF Layer ALC I would pair it with more of a medium-hard European sponge, or a Chinese rubber treated to behave more like a tensor. Instead, I use a more linear blade that doesn't cover as wide a speed range but has no discontinuity.
*In fact it is too fast and reactive (almost bouncy) at times, for instance in the lobbing/fishing department... very difficult to kill the pace from incoming smashes/drives.