For a mere $249.99, I don't think I have anything really negative to say about it. It must be good enough for the dough you pay, much like reviewing the Nikkor 50mm F/1.8D lens.
Some say, mirror lens have lower contrast but does it really matter at the above price? So what if you can only manual focus with this thing?
So what if its made by Kim Jong Il? So what if he made it in her mum's kitchen? $249.99 versus Nikkor 600mm F/4's ten grand price tag is just impossible to balance out.
Get it [here] if you feel like having some clean fun today. Or [here] for some real serious, no-nonsense, hard-core photo shooting!
UPDATED - Kim lives in the North. Bower is made in the South.