Instruct: Classify a review into positive or negative sentiment.
Query: Handy Little Optical Slave Flash

This is a really handy little slave flash. It has just one power setting (Full Power) so I use it for ceiling bounce only. With NiMH rechargeable batteries, the cycle time is only 1~2 seconds.Adjusting the camera on-board flash down (-1 EV to -2 EV to provide softer front lighting and aiming the slave (on a tripod next to me) at the ceiling to provide a bright top lighting, I liked what I got so far.All the on-board flashes I tested (I tried 5 different cameras, with and without pre-flashes) triggered this slave without a misfire, once it woke up. Please read on.Only problem I encountered was that when first started it would not sync/flash until I pointed the camera's on-board flash directly at the slave and "woke" it up with a few flashes. Once it responded with a bright flash, all sessions afterward would sync properly. If I turned off the slave and restarted it, I had to "wake" it up again. Slight inconvenience, but at this price point I have no complaints.