Pros: small, compact, light weight (good for bird photography), TTL, adjustable light angle for use with 24mm-105mm lenses, manual mode use cases, high-speed synchronous mode (runs at 1/8000s speed), powerful. Cons: It took a while to set up the settings and figure out, not easy to shoot with my camera (Pentax). Overall, I'm really impressed with the flash. This is my first time using TTL flash; What a beauty and relief! In addition, the high-speed sync mode makes life easier for me in difficult lighting conditions. It is powerful enough to give enough light for an object (birds) at a distance of 15 meters at a setting of 105mm. Basically I am satisfied with the product. I can't say anything about reliability. Flash, it's only a few weeks of ownership and use. Does not work with batteries.
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