Riser: I have a Morrison Phoenix 15" riser with a Jager low grip. The Jager grip is awesome! It is narrow and flat on the belly side, which is perfect for me because I press my palm (life-line to edge of thumb) against it and then softly wrap my middle finger around the front of the riser. The nice thing about the ILF risers is that you can always find a grip to match your form. Also, Bob set it up with a sealskin rest and I added a stubby cushion plunger which allows me to easily adjust for the two different diameter arrows I shoot.
Limbs: I have a few different sets of medium RC limbs ranging from about 35# to 50#. Medium limbs + a 15" riser makes a 58" bow. Regarding limbs... I've spent up to $695 on a set of foam/carbon limbs and as little as $150 for wood/glass limbs, and in my opinion, I don't think the $695 limbs out-perform the $150 limbs by all that much. They look cool, they are light, and probably have an edge in performance, but in my experience, carbon is more fragile and a bigger liability when your bow is getting knocked around in the deer woods. I'm not hard on my gear, but accidents happen. I recently bought a set of the BlackMax2.0 limbs (50# @ 28") from Lancaster Archery for $150. I've been really happy with them - they are the only limbs I am hunting with this year.
Adjustability: The Phoenix riser allows you to adjust the draw weight +/- 5 pounds. It also allows you to adjust tiller, which is really the only adjustment I use. I shoot 3 under, and I can adjust the riser to achieve even tiller for all my limbs. I don't like to be constantly tinkering with my gear. I like it to be reliable and ready to go when I practice or hunt. ILF bows give you the option to adjust draw weight, tiller, AMO length, limb type, grip type, etc., but since I did the initial tuning, I have not adjusted anything. I favor simplicity, with a little bit of flexibility mixed in, and to me, that's what the ILF bow delivers.