The Cullmann D4500 does his job: He makes light. Of course, he can not be compared with a SB 600, although it is so. Is i-TTL well, manually it can be adjusted well, and what I like very well, he is in the display beautifully illuminated, Schwekbar in almost all directions (except down) as a remote flash available (when: But now to the practical the camera supports this, od. Eg if you have a SB 800). Disadvantages: the plastic foot (so far he maintains), the volume of the zoom motor, and no bag included. Conclusion: For little money a good beginner / second flash. I'd 'buy it again