pamike,
I tested the LBX (and the comparison top-end ILF limbs) on a 17" Dryad Epic ILF riser. All tests were done at the mid-point of the ILF limb bolt range, with even tiller, at 28" AMO, with a 9 grains per pound arrow, using the same string (all limbs tested were longs), with all shots being taken out of my Hooter Shooter shooting machine. The LBX limbs shot 198.1 fps with a BH of 7 1/8" (which is about the mid-point of BH recommended range for those limbs on this riser). I tested the 3 best-performing ILF limbs I own at 7" BH. One of the recurve limbs is the latest and greatest 2015 model, another is last year's top-end model from another highly respected company, and of course I tested our Dryad ACS-RC limbs too. At 7" BH the three ILF recurve limbs ranged from 199.6 fps to 197.3 fps (ceteris paribus).