I sent in a For SIGMA 70-300MM F/4-5.6 APO MACRO SUPER for repair. They said they would send me an estimate. But they tried to take $100 out of my bank account before they even sent the estimate. Fortunately, I didn't have the 100 in my account. Debit card denied. I asked them why they were trying to take money out of my account before the estimate, their reply was "they always take the initial amount out. If it's less, we refund you that amount."
I called them and they apologized for that, yea right. Then after two weeks, they sent me an email saying that they couldn't fix it and would have to send it to the Sigma manufacture for repair. I said ok, but have not heard anything from them since. I fear that this lens is going to be gone for a long time. My advice, look somewhere else!