I was looking at their 500mm f/6.3. The reviews I found were not encouraging; average to below average. For your information, I've checked with them aout the shipping cost, it's about USD30. Payment is via PayPal.
I own one, 500mm F 6.3, not exactly th sharpest lens but fun & cheap. Tough to focus, any shake and sometimes i'm not even sure where is my subject and i have to hunt for it again.
The most important thing to note is that if sharpness or contrast is important thing to you, please do give it a miss. This is a manual lens.
Astrophotography, i have not used it much yet as Singapore's light pollution is bad and not sure where is a good place to take such shots plus my E500's night long exposure shots isn't the best to use either.
Let me share some pics taken with this lens, if any qns, feel free to ask
Taken from esplanade Balcony at a ndp rehersal.
Taken at Singapore Birdpark
If you can control the background, this is the famous ring bokeh!