Try a search on this site and via Google for lensclearance.com, you'll find several threads & posts over the past few months. These should provide enough information to decide how much risk is involved in buying from them.
I stick with well known & reputable stores.
|Hot Air Balloons Over Bagan by User9320321874|
|Blue mood by darub|
from Fixed lens shootout.
|Yellow Warbler by LeeS|
from A Big Year - birds
|Waiting for the Parade by tcoker1103|
from - La Vida Loca - (Black and White Street Photography+ A Border)