Firstly, this lens is not going to win any awards for high quality.
However, having dispensed with the negative, it has a lot going for it.
I bought this to indulge my current fad for producing web panoramas - and being reluctant to spend ten times the price for something which might be gathering dust in 3 months, this is an excellent compromise.
Delivery from the supplier was within 3 working days, and included a USEFUL free gift rather than a token gesture - they have really got their act together!
In summary, a very good, acceptable and usable lens to dip your toe in the waters of fisheye / panoramic photography. Should you subsequently decide to swim a little further out, you might want to spend a bit more.