OK so heres what I use
http://www.westechrigging.com/chain-slings-single-leg-mgs-grabiq.html
Buy 2 and get free shipping and you will never need another sling. They are so quick to use and you can adjust it by the link. Groundie never has to touch the ball just unsnap the hook.
Only downside is they can hurt if you get hit by them
I would NEVER go back to slings