I know of many people who when considering a flash always kick out the little 400. THIS THING IS GREAT!!!!!! I have owned mine for about 10 months now and I absolutely love it! I also own an SB-800 and that thing is amazing as well. HOWEVER, the 800 does not compare in areas with 10 to 20 feet ceilings where if you have that 400 bounced to 90 degrees and set to ttl, it is amazing. Not only that, it is extremely lightweight, and also low-key if you are at a party or get-together of somekind. I am a proffesional photographer and have found many times of preference for the 400 over the 800. If you have any comments or disagreements, they are all welcome here.