Last week my trusty old Nikon SB-600 stopped working on me. Thankfully I was just messing around the house and it didn't do out when I needed it. That's why it's always a good idea to have a backup for these types of things. I took my old Speedlight back to Bedfords Camera, I had it so long that it was not covered under the warranty anymore, but they packed it up and sent it off to Nikon for repair. It looks like it will get fixed, but it may be a few weeks. So today I went back to Bedfords and picked up the new SB-900. This is a beast of a flash. I would say it is about 3 times the size of the 600. It can really throw some light, but with the control of a highly electronic and sophisticated strobe.