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b. The flash tube and associated electronics are put onto the tiltable section that extends out somewhat further than those of competitors. This might lead to a bit more of a tendency to red-eye return with telephoto shooting, so you may wish to take advantage of the tilt facility to bounce your flash. On the other hand, it might be just the ducks for macro and close-up.
c. It's three-channel wireless control on the back with two control dials and an LCD screen to report what's happening. Fairly easy selection of whatever mode you want. Easy manual setting.
d. Constant video boost or modelling light in the front.
The basic cost of this is also well under that of the dedicated manufacturer's flash for my camera - and so far I have had two of those on-brand items pack up on me. So I would seriously be tempted to see what the Nissin can do. Nikon and Canon people might also like to have a go.
Accessory note: Investigate the Mag Mod attachments for this flash, particularly the Scoop. You'll find them down on the sales wall around the corner from the Nissin flashes. The illustration shots for this post were taken using one and the lighting is delightful - fast and easy, yet soft.