Azamax!!

is it really worth the money?

It works well, and doesn't cost much more than Einstein oil. It even destroys unhatched eggs in my experience, though I've only had to use it once (thankfully).

I had some indestructible bugs - cleaned all leaves with mild lavender soap, then sprayed spinosad with no luck. I fogged the place twice, then sprayed with pyrethren, and finally Azamax. Azamax is the only one that had an effect.