Bought a sigma 50-150 os in Nikon mount and at first was a bit worried about spending so much on an item coming from overseas especially when 80% of it is glass. I read the hundreds of positive reviews about the lens and the company so decided it was worth saving the £250 against the current Amazon price. All I can say is that the service from this company is unbelievable. I ordered late on a Thursday night and received the item first thing Tuesday morning. I was able to track the item and by the time it arrived there were 12 steps shown on the tracking screen. If you are worried about using this company I hope this and every other good review puts you at ease!