I have bought several times through Yoybuy. Unfortunately, my experience has not been very good. It all starts out when a Taobao seller says he has a stock of, say, 99. When I want to buy one or two, Yoybuy tells me the seller is out of stock. I have suggested blacklisting this kind of crooked seller, but Yoybuy refuses to do so.
Secondly, in most cases I do not know the Chinese inland postage. I have had at least one case where it reached almost 50% of the price.
Thirdly and most annoyingly, when all items have arrived at Yoybuy's warehouse and I submit delivery, Yoybuy's system makes an estimate of shipping costs. They will not pack up, weigh and calculate the true shipping costs until I have paid the estimate, leading either (rarely) to a reimbursement or (in most cases) to a heavy second postage. The financial risk cannot be calculated. This is all the more burdensome as it could easily be changed. I have told them a dozen times, but they seem unwilling or unable.
Worse yet, Yoybuy has sent me the wrong items that cost me $25 and even after five e-mails wants to give me just $10 to make up for it. Not even in money, but in their ridiculous points!
Just when I thought it could not get any worse, they came up with a new trick: When I had asked if the item was still in stock, I got a positive reply, so I odered and paid. Guess what happened? "Item out of stock." :-o Not just once, but they pulled off this trick a second time! I think they do not even ask the sellers, but always claim they have stock.
Seriously, I have no idea why some other reviewers use words like "best", "honest" or "great" in connection with Youbuy. They must be Yoybuy employees.
My conclusion is: Buy from AliExpress.com whenever possible. Otherwise use Taobaoring.com when there is no other option.