I have had one for about 3 weeks, the spec seems good for the money and so far the quality seems good. It works as well as my 430ExII in TTL mode on camera, but has less flexibility in terms of the number of power settings in manual for OCF use
It works as a wireless slave which is good (if you have another speedlite that can work as a master), however it does not work reliably with the cheaper radio triggers. I have modified mine to allow a sync cable to be used from the trigger to the light - this is a simple mod that makes it a lot more flexible.
I would recommend it, In fact I am planning to buy another one in the near future!