for me, it's all con, i see no advantages of string follow.
the many "string follow" backset bows i've shot all exhibited some form of jarring, rattling shock on release. i never felt any kinda "stability of shot" with these bows. they were all "thumpy" and slooooow when compared to longbows of the same cut that at least had reflex in the limbs (think: yer basic, standard howard hill longbow).
why in the world would i wanna put up with that when i can just as easily have a longbow that has that classic "D" braced limb shape, pulls easily and smoothly, with zero -and i mean no, none, nada- "hand shock" on release, and far better overall performance? here i'm talking about most any mild r/d longbow.
now that's my personal take, after messing with many longbow types for too many decades - and you did ask for opinions! :D