I've had two. Both purchased new. They do come with a lot of grease, but a careful cleaning will handle that.
Don't be surprised if there is some "dieseling" and a louder report than you'd expect with the first few shots... there will be some oil smoke too, because of the oil in the barrel and probably elsewhere.
I've had those cheap Daisy red-dots (about $10 at Walmart) on mine and it is sufficiently accurate for me. I've read pieces by others about good accuracy with scopes and a bit of tuning.
A great website for these, and other Chinese guns is:
http://www.network54.com/Forum/113813
Also
http://www.funsupply.com/airguns/Fast%20Dear%20Tune%20up.htm for a great piece on tuning the Fast Deer.
Seems to be pretty well made and a great gun for the price in my opinion.
Cheers
Kerry