i just recently purchased the new Nikon SB-900 speedlight. it is not all it is cracked up to be. Yes, it has faster recycle time than the SB-800. But my main problem with it is that after only about an hour and a half the speedlight goes into thermal freak out mode (what i like to call it) where it shuts down so it can cool off. Being a wedding photographer, this allows me to take the getting ready photos and then in the middle of the ceremony it goes into this mode. Even after letting cool for the recommended 10 minutes, after only taking a few more pictures it goes into safe mode again so i can't shoot with it. This doesn't really work out too well for a wedding photographer. i'm not shooting in continous mode, i'm not shooting an over abundance of pictures per second or per minute for that matter. just shooting as things happen. i've spoken with nikon several times and i guess that is just the way the flash is. has anyone turned the thermal safe mode feature off? the reason it is there is to help prevent users from burning up their flash as i guess a lot of people have done with their SB-800's (i've never done that). i'm wondering if i turned it off if i am putting my flash and camera at risk. or can i really only shoot with it for an hour and a half? thanks.