jarhead....When Bob Gordon designed the Warf bow and David Soza improved the design by designing a hunting riser that would accept these limbs they were the best recurve limbs in the world. Olympic/FITA bow manufacturers have put tons of money into designing and R&R on how to get the best, most accurate shooting limbs for international competition. Although the term actually refers to the way the limb is attached to the bow, the Korean, Chinese and Japanese companies that produce those limbs were considered to be the best in the world...both in terms of the shooting characteristics as well as materials (i.e., carbon/foam limbs were designed by Asian bowyers). At that time, 5 or 6 years ago, the only US company making that type of limb was Hoyt and they were reluctant to use their ILF limbs on a hunting bow (they have a new model coming out in Oct.). Many US bowyers, Bob Morrison, being one of the first, collaborated with Dave Soza and he soon had a wood ILF riser and soon afterwards started making ILF limbs. Now there are a number of US bowyers making ILF compatable limbs and risers. However, it is simple to make a limb that has ILF fittings. It remains to be seen if the US bowyers limbs can live up to the performance level of the Asian bowyers. So, just because a limb has an ILF fitting does not mean it has ILF performance...that is, compared to the limbs used by international ILF shooters, most of which come from Asia, primarily Korea and Japan where FITA competition is very popular and competitive. One exception would be Border Archery in Scotland.
For me, I am pleased to see US mfgrs. getting on the band wagon. In general it simply raises the bar on bow performance and the new technology is already beginning to show its benefits.
I hope I have answered your question. ILF limbs, when ILF hunting bows first came on the scene, were the best performing limbs in the world.
In addition, which is a whole different conversation, ILF limbs are very tunable, interchangeable and come in "beginner" and high end models. You can do a lot with one ILF riser and a bunch of ILF limbs.