For the brewers who have made the jump, are you using something like this http://www.northernbrewer.com/shop/ball-lock-conversion-kit-for-sanke-couplers.html
... and continuing to use your ball lock connectors?
Or something like this?
http://www.homebrewing.org/American-Sanke-D-Coupler_p_764.html
You can use the conversion kit but that adds height to everything and if you dont have a tall enough collar it will cause issues. I went right to the D couplers and never looked back cuz i knew i wasnt going back to cornies. So make sure your setup has the height available.