Bought this as cheap stop gap until getting around to investing in something more substantial. Using it to provide as a subtle always on effect.
Pros: It is inexpensive; It is very sturdy, Allows for reasonable variation of dept and speed of tremolo. Exactly as advertised, provides a decent and smooth tremolo effect, no unnessary frills.
Cons: Fairly large. Power connection input not great, somewhat loose and tends to cut out if moved slightly (was using standard Boss connector); Found sound to distort slightly when using 9V battery. The wave form knob doesn't really do much.
If you want to add a touch of tremolo to your sound and don't want to spend too much and have space for a large pedal this is ideal. All in all this is good value for the money, Very reasonable for the price.