KODY Professional TTL Flash Triggers are a great set of TTL based triggers that have advantages over their competitors.  It allows for mixed ETTL and remote manual groups, which is a great feature to have, especially when trying to control your lighting environments.  It can be mixed within any of three groups.  It also has the capability of HSS of 1/8000th, Second Curtain Sync and Manual/Auto Zoom settings within the same groups.  The top hotshoe of the transmitter also allows for ETTL pass-through, a great additional to have light set up from the front, without needing an extra receiver.  The transmitter's screen is also a nice size, displaying the necessary information without getting in your way of shooting.