i was interested in the sigma 18-35 but they are not in stock anywhere here in the states so i bought one from digitalrev. it arrived and i loved the lens but it had really bad af issues. their website states that they have a "14 day no questions asked return policy". i submitted a return request in that time but did not hear back from them for a few days at which time they "regretted to inform me the return period had expired". some emails back and forth and they agreed to accept it back with a lot of "ifs". i have to pay return shipping and if they determine its a manufacture defect they will reimburse etc. i shouldn't. have to do this but i got a sigma dock and spent all day getting to work in a usable way so i am still happy to have it but i would warn anyone considering buying from them to keep this in mind.