I've used them (quite a bit) over the course of the Journeyman league. My thoughts;
--Always take a full unit if you can--as they will draw fire and you often need to drip feed a few to prevent a big alpha strike against the unit
--Gang is tough to get with medium bases with no reach. Don't be afraid to run one up, forfeiting your charge if it's between two models other models will charge. +2 to hit/damage is often needed
--Slaughterborn is obvious (which you already have taken)
--Denny can make any unit look good
--Stay away from other tough units if you can--it breaks Slaughterborns ability