The hähnel Modus 600RT speedlight for Canon, Nikon, Sony and Fuji has proven to be fairly popular. Not quite as popular as Godox, perhaps, but popular enough that hähnel have seen fit to release one for Olympus and Panasonic Micro Four Thirds systems, too.
As is the trend these days, the Modus 600RT is a lithium-ion battery powered flash. And as such, it boasts longer life and faster recycle times than traditional AA powered speedlights. It supports TTL, High Speed Sync, repeat flash and full manual control. But is it worth $250?