although my own models use a spektrum 2.4 ghz system , ive just purchased a tactic 850 on behalf of a freind for his lifeboat im rebiulding , lots of features including chanel mixing , proportional slide switches , 3 position switches , which are all assignable to chanels within the tx , model memory etc , ive so far set it up to mix ch1& 3 so i can operate throttles with either a single stick or two sticks & trim tabs on a slide switch , the combo set was around the £150 mark so well priced too