I bought an Andonstar after Dave's review, and for $60 I think it does a good job.
Anyway after a couple of weeks the LED light would no longer turn off. I figured the pot had failed , and since I don't find the light practical I thought I'd just unsolder the wire from the pot. To my surprise, the light stayed on.
I couldn't work out how to get the body of the camera apart safely, so I wrote to Andonstar support to ask how. They wrote back saying they would send me a new unit, which tuned up a week later.
Very good service for a cheap Chinese supplier.