Launching this month is the new Nikon SB-910 Speedlight, the new head honcho of high-end flash units. The 910 is an upgrade of the three-year old SB-900 and features a variety of usability adjustments. The 900 featured some complex menus for users to decipher, and the 910 looks pretty much the same. It still has the same button layout, 17-200mm full-frame zoom range and guide number of 111.5 feet at 100 ISO. Other details? With an additional 5 grams of muscle added to it, the unit features more efficient battery performance, it uses hard white balance filters, and there’s a new thermal cutout feature that will slow down your shooting speed. Are these upgrades worth the $549.99 price tag? Only one way to find out.