I got this module because I wanted a cheap analogue oscillator. For this purpose it's great, as it is essentially two oscillators for half the money. You have to be not too picky about what you get though. My two biggest issues are stated below:
When it came in the tuning was way off, not even 2 octaves proper tuning. On the back there are trimmerpots to adjust the tuning, and after 20 minutes of tuning I got both to track properly across at least 5 octaves. I haven't taken it to other locations, but I imagine temperature differences might make it drift again.
Another (smaller) issue: the tuning knob on the front is very easy to bump and at some point you will do this and it will mess up your patch. It's is annoying but not a dealbreaker.
The biggest warning I would give is: only buy this when you can comfortably re-tune it. If you don't have access to a tuner, buy something else (or buy a tuner too:) )