ILF is a mounting system, and has nothing to do with performance. That is up to the limb maker.
The big advantage is you do not need to have limbs from the same manufacturer as the riser.
I just started shooting a couple LAS ILF bows. The Titan and the Pinacle.They come with LAS /Samick limbs,but any other limb made for the ILF system will fit.
Win & Win,Hoyt,Border,Morrison,KAP ETC.You can have low end cheap limbs,the finest Olympic limbs , or custom limbs .
The ILF system allows for precise tuning and limb alignment.Tiller is adjustable and draw weight is slightly adjustable.
You can set the bow up for optimal performance based on your draw length and where the bow starts to stack .
So far I have not found anything I do not like about this system and lots that I do like.
Pete