Their own website features "testimonials" from the customers who say they saved 25-30% off going market price. So, I try the first product. 35 /1.8 OSS. Lens sells on Amazon for $448 and quite often there are $398 sales. I figure 20% off $448 is $358, offer them $370. They emailed me that I am way too low and offered it for $419. A whopping 7% savings and most likely a return headache if there's any problem with decentering or what not. Then I try another product. Sigma 19/2.8, currently on sale at B&H for $169. I offer $140. The reply - "we're overwhelmed at the time, please hang tight, will get back within 24 hours". Here's the kicker... you can't delete your offer once posted. And you're under obligation to buy your item if your offer is accepted. So, now I have to wait for a day, and my offer is active for two more days, in the meantime the sale at B&H may end or they will run out of stock. So, be careful and plan ahead... not saying it's a bad service - but know what you're getting into. Don't bid if there's a sale going on, unless you're sure you can wait for 3 days.