Quality Product! Works great, and can get up to 1/4000 of a sec, easy with the right wireless remote. Strong enough to over power the sun! With the A+B Setting you have the full 600ws working for you, its a little slot to charge up for the next shot, but very minor! Paid for, shipped, and dropped off, all within 2.5 days! Amazing service! I'm only giving it 4 stars, due to the fact that the remote is not working, but at this point and time, I suspect a dead battery.