ILF is simply a limb attachment system; nothing more. But the fact that the system is universal makes it incredibly valuable for versatility and convenience. The models that offer lateral limb adjustment are even better yet.
For me, the real appeal is the ability to shoot whatever limbs I want on whichever riser I like. If I want a second set of limbs, I can log onto the internet, choose from several different retailers, and have them at my door the next day. If I simply want wood and glass limbs, I can find them new for a $100 or less. Or for under $500 I can get top end limbs used by the best recurve archers in the world (i.e. Olympic archers) from manufactures that spend five figures and up in R&D every year. In my opinion, that’s huge.
Like YORNOC said, ILF has been dominating recurve archery in general for a few decades now. It’s only in the last few years that it stopped being taboo in many traditional archery circles. And much of the doom and gloom wives’ tales about the supposed dangers of using the ILF attachment system on shorter hunting risers have long since been dispelled.
What’s really nice is seeing all the custom bowyers building bows with ILF fittings. If a person wants to go the nice wood / custom route, there are several to choose from. If he/she wants to go off the rack, the selections are even greater. The price range is one that can fill most any budget. For under $300 a person can get a decent riser and wood/glass limbs. Or an archer can spend upwards of a thousand dollars for a more expensive riser and top shelf limbs.