When I was rigging nearly all splices where manually done in the ropers shop but they started bringing in wire slings with ferrals on them. What I found to be a pain in the backside was when reeving a sling the ferral would most often sit on the edge of the load making packing the corner a pain or sometimes would hinder the reeving of the eye. The other complaint I had was that with a splice everything is out in the open and could be inspected visually for damage, corrosion or chemical damage. Never saw a Ferral one come apart but still very doubtful using something that could not be checked except under load. I know that not all ferrals pass the rigid tests that they apply but how long before we start getting lax testing methods on them. Glad I am out of the game now.
That's the way the mop flops.
My thanks to Brian for this site.