I have a lightning trigger and have had pretty good results with it when everything goes well. It takes the right mix of storm though and when it works it works well.
http://imageshack.us/g/7/130ra.jpg/
http://imageshack.us/g/839/003fkrj.jpg/
My main issue is location more than anything and sensitivity is not a problem, infact in daylight mine is over sensitive if anything. But RAW can be a problem as it can fire hundreds of times in a good storm and fill the card up too quick plus the processing lag, I tend not to use it with the trigger anymore.