Hi there,

I have the Cactus KF36 and have used it for around 2 years without a problem. Both red and green lights flash and I rarely 'form the capacitor' as the manual states.
What power setting do you use in general?
That said I also bought their AF45 unit and have found it to be a complete lemon. It quite often doesn't turn on properley and 90% of the time it's only good for a few exposures before it shuts itself off.

At the end of the day you are buying cheap equipment so you can't expect a reliable product.